视频对话：
All right, keep it at that level.
好的，保持住这个水平。
Let me know if the readings fluctuate.
如果读数发生波动告诉我。
本期学习词汇：
fluctuate
vi.波动；涨落
vt.使波动；使动摇
例句：
1. Body temperature can fluctuate if you are ill.
人患病后体温可能会上下波动。
2. They often fluctuate with the international money market.
它们是随着国际金融市场变化而波动的。
3. Vegetable prices fluctuate according to the season.
蔬菜的价格随季节而波动。
4. The price of volatile stocks will fluctuate.
不稳定的股票价格将会上下波动。
5. However, some bonds have interest rates that fluctuate during the life of the bond, usually at a spread over a reference rate.
不过，也有一些债券的利率在有效期间是浮动的，一般上它们会根据一个参考利率制定。