他发动了汽车，车发出平稳的嗡嗡声。He started the car, which hummed smoothly.我们以平稳的速度开车.We drove at a steady rate.他的精神总是平稳的,并且他又是个循规蹈矩的人.His spirits were always equable and he was an observant person....
Hydrogen is used extensively in industry for the production of ammonia.氢气在工业上广泛用于制氨。He mobilized public opinion all over the world against hydrogen-bomb tests.他动员全世界的舆论反对氢弹试验。Carbon, hydrogen and oxygen combine chemicall...