- above
经常用来指前面提到过，表示“如前所述，as discussed above"、“前面的方法，the above method"等。但above不确定时，用起来容易，读起来不易明白，容易造成表达不清。这时应把所指的事情明确地写出来。类似不明确的字还有former,latter,应避免使用。
- absorption, adsorption
adsorption is to the surface, not inside.
- access, assess
access是接近; assess是评估，估价。
- adapt, adept, adopt
adapt是动词，适应; adept是形容词，熟练的;adopt是动词，采用。
- affect, effect, impact
affect是动词，影响（influence)的意思。如“温度对细胞生长的影响”可表示为“Temperature affected the growth of cells"
effect是名词，是结果(result)影响的意思。有时也可以作动词，招致(bring about)的意思。科技论文中很少使用effect的动词形式。
impact当冲击，碰撞讲。如"Western popular culure has a huge impact on Asian society"自然科学不同参数的相互影响一一般不用impact来描写,用affect或influence更合适。
- agree to, agree with
agree to是同意,giving consent,“I agree to a biopsy test"; agree with是一致, in accord, “ The results agree with our previous observation".
- alternate, alternative
altemate是交替的,轮流的; altemative是另外的,选择的。
- and
and是一个非常有用的词。它是一个最被经常用到的连接词，可以连接类似的词、词组或句子。用and连接的词、词组或句子是相关联但又各自独立的。当排列三个以上的词时，最后的一个词之前加and,其他的词后都加逗号。
Pollution in the river affected the population of dfferent animals, such as fishes, birds, and turtles.
and之前也可以不加逗号。
Pollution in the river affected the population of dfferent animals, such as fishes, birds and turtles.
一般认为and之前加逗号是美国写法,不加逗号是英国写法。
用and连接句子时，若两个句子都很简单，中间可以不加逗号。
One liter of water was added and the solution was left at 4 °C overnight.
但中间加逗号也正确。
One liter of water was added, and the solution was left at 4 °C overnight.
两个比较复杂的句子中间一定要加逗号,以便于阅读和理解。
The assay was carried out by heating the sample in boiling water for two hours, and the volume of the assay solution was kept constant by adding water.
用and来开始一个句子也可以,and起到对一些相关和并列的描述来连接的作用。
AIDS drugs are effective to control the replication of HIV, but they cannot cure AIDS. And a vaccine for AIDS is still clusive. Therefore, education and prevention are the most effective weapons against AIDS for now.
用and连接两个独立的句子时,可以在and之前加逗号，也可以不加逗号，但连接一个不完整的句子时,不能用逗号分开。
The sample was added to the testing solution, and allowed to react in a water bath at 37°C for 10 min.
宜改为: The sample was added to the testing solution and allowed to react in a water bath at 37°C for 10 min.
but的用法与and很类似,只是它连接的句子是对照和相反的。
- apparent (apparently)
apparent有“明显的,obvious, clear” 和“貌似的,seeming” 两种用法。具体是哪种用法,句子的前后内容可能会有提示。在不能确定的情况下,应避免使用,选用obvious或seeming更好。
apparently也是一样,选用obviously或seemingly.
- appear
有“出现,to come into view"和“好像,seem” 两种讲法,一般在科技论文中,当“好像,seem"的用法要多些。
Afer cooling down to room emperature, yellowish crystals appeared,
lt appears that defomation of frogs in the Hui River is caused by pesticides.
- as
as有很多不同的讲法,它有表示因果关系的用途,类似because和since.但表示的因果关系最弱,since在中间,because的因果关系最明确,所以不要用as来表示因果关系,用because或since.
as用来表示“同样地”，“....一样”。
As soon as the body emprature reached 39°C, the child has to be sent to the emergency room.
也当“在...的时候，when" 讲。
as the snow sarted to melt, the team went back into the forest to collect samples.
- augment
to make (something already develped or well under way) greater,as in size,extent,or quantity继续增长，进步扩大。
- average, mean, median
average和mean都是平均的意思，mean是个数学用语，median是一个系列中的中间的那个值。
如2,4,8,16,32,average 和mean是12.4，median 是8。
- because, because of
用because来表示因果关系是最明确的.Because后面写句子,because of后面用名词。
The tiger population decreased dramatically because their habitat was destroyed.
The tiger population decreased dramatically because of loss of habiat.
for和since表示的因果关系要弱些，用since时往往强调的是当时的情况、时间、地点等,有中文的“既然”的意思。as表示的因果关系最弱。
Since the weather is hot and humid, we decided to take a break.
- below
与above一样，所指含糊，应避免使用。
- conserved, conservative
conserved保存的,保持的: conservative 保守的,守旧的。
- continual, continuous
continual是经常发生的: continuous是连续和不间断的。
- correlated with, correlated to
correlate with是正确用法,correlate to是错误用法,related to是正确用法。
- deduct, deduce
deduct是扣除,deduce 是推理。
- design, designate
design是设计,构思; designate 是指定,指出。
- different from, different than
事物之间不同用different from,人物之间不同用different than。具体的语境中different from不能写成different than。
- diminish, decrease
diminish削弱,减为很少; decrease减少,并不定减为很
少。
- dramatically, drastically
dramatically是显著的; drastically 激烈的。
- in contrast, on the contrary
in contrary是错误的。
- induce, provoke
induce引发; provoke 挑拨,科技写作中很少使用。
- preceding, proceeding
preceding前面的,proceeding 进程、事项。
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