重点讲解：
1. cancel out 抵消；
He wonders if the different influences might not cancel each other out.
他在想,各种影响能不能相互抵消081^b;OvDUQE。
2. block out 挡住，遮挡；
Thick chipboard across the window frames blocked out the daylight.
装在窗框上的厚厚的胶合板挡住了白天的光线xDA_ZzBh7i。
3. come in handy 派上用场；
That key will come in handy if you lock yourself out.
要是你把自己锁在了屋外，那把钥匙就派上用场了En3w2)Mb;M|9。
4. do the trick 奏效；达到目的；
I don't know what it was that did the trick, but I am definitely feeling much better.
我不知道是什么起的作用，但是我确实觉得好多了LD5maIsH2#A!i_,p。