They were afraid their money would drop in value, as more silver money was put into use.

VOA: special.2010.06.17

At somewhere like "New York Yoga", you're going to have to pay $25 to drop into a class,

在某些地方像“纽约瑜伽”，就算只是参加一堂课，你也得付二十五美元，

上东区的瑜伽老师 - SpeakingMax英语口语达人

So you should drop the homework before you come into class, rather than furiously work on it during class, and the solutions will be posted the same afternoon.

所以你应该在进教室之前交作业,而不是在上课的时候乱写一通,作业答案会在当天下午发布到网上

耶鲁公开课 - 基础物理课程节选

Because it's a gel electricity is going to move through the gel because there are ions in it the same way - for the same reason you don't drop an electrical device into the bathtub because charge moves through water that has ions in it.

由于凝胶中存在离子,电流会通过凝胶,同样--,因为同样的原因你不会把电器扔进浴缸里,因为水里也有离子,所以水可以导电

耶鲁公开课 - 生物医学工程探索课程节选