The middle button of his uniform jacket was strained over his belly.制服上装中间的纽扣在他的肚子上绷得紧紧的。Smiling for the cameras, the two men strained to make small- talk.两名男士微笑着面对镜头，东拉西扯着。His voice had lost its resonance; it was tense ...
The infra - red spectra of quinones present a number of interesting features.醌类的红外光谱具有一些有趣的性质.Ethylene and trans - dichloroethylene are both inactive in the infra - red in this region.乙烯和反式二氯乙烯在红外光谱的这个区域都无活性.Infra - red ...
Encouraging teacher transfer would not, by itself, integrate the teaching corps.鼓励教师调动本身不会消弭教学队伍中的种族隔离。The machine will start by itself in a few seconds.几秒钟后,机器将自行启动.With regard to hardness, the diamond is in a class by ...