重点讲解：
1. used to do sth. 过去常常；过去曾；
例句：He used to go for long walks on the moors.
他过去时常在荒野上长时间地散步QVXW2A3tXrtk%@。
2. make sure 一定要；设法保证；
例句：Screen her bed and make sure she is not disturbed.
把她的床隔开，确保她不受干扰Mc_LG1TV~[WRd。
3. go through 经历，经受；
例句：In the recession, our firm went through a bad time.
我们公司在经济衰退时期历尽艰辛Hz~*zut()dfsQB。
4. end up 最终；结果；到头来；
例句：Don't end up regretting what you did not do because you were too lazy or too frightened to soar.
不要到头来后悔自己因为太懒或太怕高飞而无所作为YJ;IX;5mV(B_6]zF。