重点讲解：
1. don't bother to do sth.
不用费心做某事；
eg. Lots of people don't bother to go through a marriage ceremony these days.
如今很多人不再费心思举行婚礼。
eg. Do not bother to come and see me off.
别麻烦来送我了。
2. have no idea
（表示强调）不知道/一点儿都不知道；
eg. I have no idea what you mean.
我一点儿也不明白你的意思。
eg. We have no idea how to persuade him to give up the idea.
我们不知道如何说服他放弃这个念头。
3. plunge into
将…投入；将…插入；将…刺进；
eg. She plunged her face into a bowl of cold water.
她把脸扎进一盆凉水里。
eg. Moved to tears,he resolved to plunge into the new battles.
他感动得流下泪来，决心投入新的战斗。