The cold water supply line to tempering valve should always be opened first to prevent possible thermostat damage.
通向调温阀的冷水供应管道应该总是先打开，以防止对温度调节装置可能产生的损害。
The practice has proved the steel pipe produced by on- line water quenching and tempering a rational technology with low cost and strong marketing competition.
实践证明，利用轧后余热对钢管进行在线水淬，工艺合理，加工成本低，产品具有较强的市场竞争力。
When I am tempering a piece of steel, I first heat it, hammer it, and then suddenly plunge it into this bucket of cold water.
当我锻炼钢铁的时侯，我先把它在炉中烧红，然后用铁锤锤它，又忽然把它投入一桶冷水中。
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