钢制管螺纹。螺纹量规。过端和不过端螺纹塞规。

Steel conduit thread; thread gauges, "go" and "not go" thread plug gauges.

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不过，法国一组科研人员日前研制出一种可以“自我愈合”的橡皮筋材料，用这种材料制成的橡皮筋断了之后，只需将断裂两端按住几分钟，就能恢复得完好如初。

But a group of French scientists have made a self-healing rubber band material that can reclaim its stretchy usefulness by simply pressing the broken edges back together for a few minutes.

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不过这有可能会非常低效——我们希望WHERE子句的计算更接近数据端。

But this is likely to be very inefficient - we would rather the WHERE clause be evaluated closer to the data.

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