I bought a bottle opener yesterday.
我昨瓶器。
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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、沙拉钳和都是杠杆,这表明在一端施加的向下的力,可以在另一端向上转移并增加,从而用很小的力就能举起重物。