这就需要吊桶在下到几百米下的水底自动把料卸掉，但现在矿井常用的挂钩式吊桶和座钩式吊桶已经不能满足这个需要了。
However, the present hook bucket and seat hook bucket that used in the mine wall has been unable to meet this requirement.
这就需要吊桶在下到几百米下的水底自动把料卸掉，但现在矿井常用的挂钩式吊桶和座钩式吊桶已经不能满足这个需要了。
However, the present hook bucket and seat hook bucket that used in the mine wall has been unable to meet this requirement.
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