Instead,you should use sand from rivers or from other areas of land that are not near the sea.

VOA: special.2009.09.14

If the question of time is not explicitly brought up, then you should know that you have to use this formula.

如果时间的问题并没有明确提出,那你应该知道,必须要用这个式子

耶鲁公开课 - 基础物理课程节选

A little indirect but not so indirect that is difficult to understand. You should use this often.

有一点委婉，但不至于委婉到让人难以理解。应当尽量多使用这种句型。

Why don't 课堂 - SpeakingMax英语口语达人

You can pull the cord and your files should not use a different technology altogether.

你可以提取出没删除的,是用了一种不同的技术的。

哈佛公开课 - 计算机科学课程节选