視頻對話：
All right, keep it at that level.
好的，保持住這個水平。
Let me know if the readings fluctuate.
如果讀數發生波動告訴我。
本期學習詞匯：
fluctuate
vi.波動；漲落
vt.使波動；使動搖
例句：
1. Body temperature can fluctuate if you are ill.
人患病后體溫可能會上下波動。
2. They often fluctuate with the international money market.
它們是隨著國際金融市場變化而波動的。
3. Vegetable prices fluctuate according to the season.
蔬菜的價格隨季節而波動。
4. The price of volatile stocks will fluctuate.
不穩定的股票價格將會上下波動。
5. However, some bonds have interest rates that fluctuate during the life of the bond, usually at a spread over a reference rate.
不過，也有一些債券的利率在有效期間是浮動的，一般上它們會根據一個參考利率制定。