你需要确定蜘蛛的数量。

You have to know the number of spiders.

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首先，你需要确定自己的意向。

First of all, you will need to be clear on your intentions.

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你需要确定两件事。

You need to ensure a couple of things.

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You can't take the exam unless you're registered for the class, and we need to make sure we can verify that.

否则你是不能参加这次考试的,除非你注册了这门课，而我们需要确定你能证实这一点。

麻省理工公开课 - 化学原理课程节选

Then they test you to make sure that you have adequate protection, and some people need an additional shot after that.

然后医生会检测以确定你已获得了保护,有些人在测试完后需要再打一针

耶鲁公开课 - 生物医学工程探索课程节选

You don't have to be very smart to figure out where one word begins and one word ends.

你并不需要非常聪明才能够确定,哪里是单词的开始和结束

耶鲁公开课 - 心理学导论课程节选