回上一层第八部 第四课 --- 请重复跟读，直到可以於声音档的留空之间唸完整句為止；熟练之后您必将可以 "脱口而出" 地说出标準的美式英语
- meet up
- Let's meet up after school.
- mess around
- We do not allow students to mess around in this room.
- mix down
- There was a problem with the tape when we were mixing down the program.
- mix up
- She mixed up flour and water to make pizza dough.
- Clark always mixes up left and right.
