视频对话：
What are you talking about? Breaking open the coral?
你什么意思？把珊瑚打破？
They're little filters.
它们可是小型过滤器。
Okay. When the EPA comes after us I'm going to tell them it was your idea.
好吧，要是环保局来查咱俩，我就说都是你的主意。
本期学习词汇：
filter
n.滤波器；滤光器；滤色镜；[化]过滤器；
vi.过滤；透过；渗透；
vt.过滤；滤除；
filter out 滤除，过滤；（消息等）泄漏；
例句：
1. A filter to remove impurities from the water supply.
从供应水中清除杂质的过滤器。
2. Foreign influence began to filter into the country.
外国势力开始渗透进这个国家。
3. Charcoal is used to filter water.
木炭是用来过滤水的。
4. It functions as a blood filter out red and white cells.
它就像一个血液过滤器，可以把血液中死掉的白细胞和红细胞过滤掉。