I bought a bottle opener yesterday.
我
买
个

。
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口语小妙招 
口语小妙招 Teeter-totters, salad tongs, and bottle openers are all levers, meaning that a downward force exerted on one end can be transferred and increased in an upward direction at the other end, allowing a small force to lift a heavy weight.
跷跷板、沙拉钳和
瓶器都是杠杆,这表明在
端施加的向下的力,可以在另
端向上转移并增加,从而用很小的力就能举起重物。