He spotted a crack in the ground.
他在地上看到了裂缝。
Wearing heels also creates the threat of getting a heel caught in a sidewalk crack or a sewer-grate and being thrown to the ground—possibly breaking a nose, back, or neck.
穿着高跟鞋也会造成鞋跟被人行道裂缝或阴沟栅卡住以及摔倒在地上的危险，穿鞋的人有可能会摔断鼻子、背部或脖子。
The first bell was made and tested on the ground in 1857, but a four-foot crack developed and the bell had to be cast again.
1857年制造的第一只钟在地面实验时，发现钟体上有一条四英尺长的裂缝，只好重铸钟。
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