7.放出空气let the air out

6.不及眼镜重weigh less than a pair of glasses

5.沉重的笔记本电脑a heavy laptop computer

4.厌烦 be tired of

3.发电 make electricity

2.吃点心 have a snack

1. 扔掉throw away

60.许多障碍　 many obstacles

Unit 18 some phrases

59.完成任务　 complete a task

58.保持积极的态度 keep a positive attitude