台湾籍旅美老师今天交给我们的句子是：
Most species can open and close their mouths to pump the water through. But white sharks and a couple dozen other species don't do that. To breathe, they have to move forward through the water with their mouths open.
大部分的鱼类可以透过嘴巴交替开合的方式，将水抽吸到鳃里以获得氧气，但是大白鲨和其他几十种的鱼类却不是这样的。它们必须张着嘴巴向前游动才能够呼吸。
学习重点：
1.species 物种
species (n.) 物种
2.through 穿过
through (v.) 穿过
though (prep.) 尽管
thorough (adj.) 彻底的
tough (adj.) 坚韧的
3.dozen 一打
dozen (n.) 一打
4.shark 鲨鱼
shark (n.) 鲨鱼
shock (n.) 冲击
