台湾籍旅美老师今天交给我们的句子是：

They're extremely patient when it comes to new foods. They'll taste just a tiny portion at first, wait to see if that food makes them sick, and only if it doesn't will they consume the rest. This is called delayed learning, and it's why rats are notoriously difficult to poison.

老鼠见到新食物时，极度地有耐心。一开始它们只会先浅尝一点点，等着看这样食物是否会让它们身体不适，除非真的没问题，它们才会把剩下的部分给吃完。这叫做延迟式学习，也就是为什么老鼠向来很难被毒死的原因。

学习重点：

1.portion (食物的) 一份；一客
portion (n.) (食物的) 一份；一客
portion sth out (phr.) 分配；分享

2.at first 起初；起先
at first (phr.) 起初；起先
in the beginning (phr.) 一开始

3.consume (尤指大量的) 消费；吃；喝
consume (v.) (尤指大量的) 消费；吃；喝
consumer (n.) 消费者

4.delayed 延误的；延迟的；延期的
delayed (adj.) 延误的；延迟的；延期的

5.notorious 臭名昭著的；声名狼藉的
notorious (adj.) 臭名昭著的；声名狼藉的
notorious for (phr.) 以...臭名昭著；声名狼藉

6.poison 下毒；毒害；使中毒
poison (v.) 下毒；毒害；使中毒