The paper compares the methods dealing with water leakage from trough bottom of water-sealed gasholder, and introduces the construction way and effect of excavation method.

对湿式燃气储气罐水槽底板漏水的处理方法进行了比较，介绍了挖掘法的施工方法和效果。

youdao

Waves are measured (测量) from the top (crest) to the bottom (trough).

海浪是从波峰到波谷进行测量的。

youdao

A trough is built alongside the road and kept half-filled with water which is heated by oil and air fed units at the bottom.

一个水槽沿着道路建造，水装的半满，用油和空气在底部加热。

youdao

Rates have roller-coastered through two peaks and troughs in the past decade, and when the bottom of the current trough will be reached is anybody's guess.

ECONOMIST: Insurance

So even though the global music revenues are so much lower than before, what has emerged at the bottom of the revenue trough is a tougher, wiser industry that now has some solid footing on which to launch a digital counteroffensive.

FORBES: Music Industry Stops Losing Money, Finally

Both CEOs took over their companies near the bottom of the capital markets trough and have worked their companies back up to a stock price nearly identically above the pre-crash all-time high.

FORBES: Is The Stock Market Rational? P&G vs. Unilever