a mechanical aid 机械辅助
mechanical teaching aid 机械教学辅助教具
mechanical calving aid 机械接生辅助设备
mechanical hearing aid 机械助听器
mechanical l hearing aid 机械助听器
These aids would have been indispensable to very early people who would have found the process impossible without some form of mechanical aid.
远古人类会发现在缺少某种形式的机械辅助的情况下，这一过程是不可能实现的，这些辅助对他们来说不可或缺。
The tower’s main form was a twin helix which spiraled up to 400 m/1312ft in height, where visitors would be transported around with the aid of various mechanical devices.
这座塔的主要形式由一个双螺旋盘旋至400米/1312英尺高，参观者可借助多种机械设施传至螺旋体各处。
The tower's main form was a twin helix which spiraled up to 400 m/1312ft in height, where visitors would be transported around with the aid of various mechanical devices.
这座塔的主要形式由一个双螺旋盘旋至400米/1312英尺高，参观者可借助多种机械设施传至螺旋体各处。
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