重点讲解：
1. in an attempt to do sth. 尝试，试图（尤指做困难的事）；
例句：He cut desperately at the rope in an attempt to free his foot.
他拼命砍绳子，试图把自己的脚解脱开(LUOF6lX!cB)。
2. put to sleep 使（尤指有病或有伤的动物）无痛苦地死去；使长眠；
例句：I'm going take the dog down to the vet's and have her put to sleep.
我要把小狗带到兽医那里，让她安乐死o|5-)RoL*1Bc。
3. on average 平均起来；按平均值；
例句：These parcels weigh two pounds on average.
这些小包裹平均重两磅[6oKO7MB8=bBR!E%Li。
4. lead to 招致；致使；导致；
例句：Various strokes of misfortune led to his ruin.
他遭诸多不幸而一蹶不振[,]VX~Iw+KpL;z,S~。
5. be close to 近的；接近的；
例句：Her comment was uncomfortably close to the truth.
她的评论逼近真相，令人局促不安IZnXhauW;sCT(#c8f+Qz。