How many tons of ore can this machine crush in an hour?
这机器每小时可以破碎多少吨矿石？
The machine must break down at this busy hour.
正忙的时候，机器偏偏又坏了。
The machine must break down at this busy hour.
正忙的时候机器偏偏坏了。
Thee machine must break down at this busy hour.
正忙的时候，机器偏偏又坏了。
The machine must run continuously at full load for one hour.
机器必需满载持续运转一小时。
The machine must run continuously at full load for one hour.
机器必需满载持续运转一小时。
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