The wall is three metres deep.这个井有三米深
The rope is one metres long.这条绳子有一米长
The desk is two metres wide.这个桌子有两米宽
The flowers fall at 5 cm per second.这些花儿以每秒五厘米的速度下落
The man walks at 1 metre per second.这个人每秒步行一米
The plane flys at 700 km per hour.这架飞机每小时飞行700公里
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