重点讲解：
1. be full of 有大量…的；满是…的；
The pool had dried up and was full of bracken and reeds.
水塘已经干涸，里面都是欧洲蕨和芦苇Qgo-.aiP1fH%a~hs9。
2. light up 照亮；发亮；
There was an explosion and the whole sky lit up.
一声爆炸照亮了整个天空VFT*c*R*_[G!Oc;。
3. pick up 发现，找到，识别；
Scientists have known for decades that male lab mice produce high-frequency sounds — when they pick up the scent of a female mouse .
几十年前科学家们就知道，当实验室中的雄性老鼠闻到雌性老鼠的气味时，会发出高频率的声音8;4qN5Fb(Q]7,.LUFlHS。
4. a whiff of 一阵(气味)；
He caught a whiff of her perfume.
他闻到了她身上的一股香水味fF273@Uf~Nn。