If one or both tubes are completely blocked, your surgeon can attempt to open the tube.

如果有一侧或两侧输卵管闭塞，医生可能尝试疏通输卵管。

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Clipping of the output stage only occurs when both tubes are at their respective, and opposite, limits of saturation and cutoff.

裁剪输出阶段只发生在这两个管在各自，相反，限制饱和和截止。

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They hope to reduce both the number of components needed in a construction job and their weight—by replacing solid supports with hollow tubes, for example.

他们希望减少建筑工作所需的部件数量和重量，例如，用空心管代替实心支架。

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Unit 2 had been taken offline earlier that month for maintenance, and investigators later found unexpected wear on hundreds of tubes inside both units.

NPR: Calif. Reactors Might Be Retired If Restart Nixed

We packed tubes and tools, as well as a folding tire and spare spokes, both of which we ended up needing.

BBC: To Montreal, with Google as a guide

For both modes of crystal fibre, the pattern of holes is generated by stacking hollow glass tubes a millimetre or so in diameter to form a rod several centimetres thick.

ECONOMIST: A new approach to making optical fibres