The bump stores great pressure. The machine tool can be operated with multi house and gunstock.帮浦蓄压大,母机可作多组胶管与枪体操作.Success was assured and, at least to start with, the system operated smoothly.成功有保证了，至少该系统一开始运行得挺顺利。Arran...
The benzene vaporized and formed a huge cloud of gas.苯蒸发了，形成了一大团气体。The benzene ring is also seen in other compounds.苯环在其他化合物中也可以看见.Resonance theory says that benzene can be represented by two contributors.共振论认为苯能用两个参与体表示...