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1.backpack n. 双肩背包，背包；远足用的背包 vt. 挑运；把…放入背包 vi. 背负简便行李旅行；挑运
She found a seat, stowed her backpack and sat down.
她找到一个座位，把背包放好，坐了下来。
2.electrical outlet n. 插座
We need access to electrical outlets.
我们需要用电源插座。
3.geometry n. 几何学，几何结构
His idea was to apply geometry to dynamics.
他的想法就是将几何学应用在力学上。
4.barometer n. [气象] 气压计；睛雨表；显示变化的事物
A man in camp took a barometer reading at half-hour intervals.
营地里的一个人每半小时看一次气压计。
