The reason to use pure water is to limit the corrosion potential of the coolant water during normal operation.

用纯净水的目的是为了限制日常操作中对冷却剂潜在的腐蚀。

youdao

We use unilateral normal distribution of upper magnitude limit instead of fixed one and analyze the results of seismic hazard analysis of this change and engineer meaning of it.

用震级上限的单边正态分布模型代替固定的震级上限模型，分析了这种改进对地震危险性分析结果的影响及其工程意义。

youdao

Apparently in a study done by the Deafness Research UK in conjunction with Dr. Brad Backus of University College London, 14 out of 15 toys tested produced noise levels above the recommended safety limit when held close to the ear. 8 of the 15 were just fine during normal use, but the three worst offenders -- a machine gun, a tommy gun and a cap gun -- are on the "avoid" list.

ENGADGET: Christmas toy noises are/aren't dangerous