地质水中一个十分主要的事实是:当受到很大水压时，脆性材料如岩石等有变成延性材料的趋势。 High-pressure gas could be released by pressure on a trigger. 一按扳机高压气体就会被释出。 This valve must be marked with a maximum set pressure not to exceed the marked working pressure on the water heater. 这种安全法必须标注不能超过的最大设置压力和热水器的最大工作压力。 Earnings at airlines have already been under pressure amid waning demand and a record surge in the price of crude oil. 随着市场需求的疲软和原油价格再创历史新高，航空公司的收入已经面临很大的压力。
