Underground tunnel support of soft expansion rock is a main difficulty in mine construction currently.
松软臌胀岩层的井下巷道支护是目前矿山建设中的一个主要难点。
And automotive wind tunnel is a main test equipment to research automotive aerodynamics.
汽车风洞是进行汽车空气动力学研究的主要试验设备。
The main occupational hazard is carpal tunnel syndrome.
主要的职业病是腕骨综合症。
The main occupational hazard is carpal tunnel syndrome.
主要的职业病是腕骨综合症。
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