To introduce the pressuregrade of rubber hose. Steel wires are usually used as reinforcement material in high, even high and super-high pressure hose.
介绍橡胶软管的压力等级，高压、甚高压和超高压软管一般均用钢丝作为增强材料。
2
Counter-intuitively, perhaps, rampant grade inflation is adding to the competitive pressure.
也许没想到的是，优秀太多，高分泛滥，无形中也增加了竞争压力。
3
Mills start with a hard, strong construction grade wood like Douglas fir, and then preservative chemicals are injected under pressure to limit the effects of insect and rot damage.