英语介词是让我们英语学习者感觉最为头疼的部分，虽然介词本身都非常简单易学，我们很容易就能够记住介词的读音和拼写，但是介词的用法却非常复杂，不易掌握，每个介词都有不同的用法，用于修饰时间、地点，方向等或者与不同的动词、名词搭配表达不同的含义，瀚森教育英语名师根据多年教学经验，为大家全面解析介词Within的用法，介词within主要用于表示在...里面，在内部，在一定距离或时间内等，具体用法如下：
1. PREP If something is within a place, area, or object, it is inside it or surrounded by it. 在…里 [正式]
例：Clients are entertained within private dining rooms. 客户们在私人餐厅里受到款待。
2. ADV Within is also an adverb. 在里面
例：A small voice called from within. "Yes, just coming."
从里面传出一个很小的声音：“是的，就来了。”
3. PREP Something that happens or exists within a society, organization, or system, happens or exists inside it. 在 (社会、组织或体系) 中
例： ...the spirit of self-sacrifice within an army. …军队里的自我牺牲精神。
4. ADV Within is also an adverb. 在内部
例：The real dangers to these rebels came from within.
对于这些叛乱分子真正的危险来自内部。
5. PREP If something is within a particular limit or set of rules, it does not go beyond it or is not more than what is allowed. 在 (某一限制或规则) 之内
例：Troops have agreed to stay within specific boundaries to avoid confrontations.
部队已同意驻扎在特定地界内，以避免冲突。
6. PREP If you are within a particular distance of a place, you are less than that distance from it. 在 (一定距离) 之内
例：The man was within a few feet of him. 那名男子离他只有几英尺。
7. PREP Within a particular length of time means before that length of time has passed. 在 (一定时间) 之内 [PREP amount]
例：About 40% of all students entering as freshmen graduate within 4 years.
所有新入学的学生中大约有40%在4年内毕业。
8. PREP If something is within sight, within earshot, or within reach, you can see it, hear it, or reach it. 在 (视线、听力、手臂所及的范围) 之内
例：His twenty-five-foot boat was moored within sight of his house.
他那只25英尺长的小船停在他房子的视野范围之内。
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