He scowled, and slammed the door behind him...他怒气冲冲，摔门而去。He scowled his displeasure.他满脸嗔色.The teacher scowled at his noisy class.老师对他那喧闹的课堂板着脸.He just scowled at Mammy and passed it over.他只是对嬷嬷皱了皱眉头,就不再理会了.She scowled at...
碳的诸多同位素the many isotopes of carbon碳的化合价是4价。Carbon has a valency of 4.通过环氧化和氧化就得到外消旋的含十八个碳的昆虫返动激素.Epoxidation and oxidation gave the racemic C 18 - juvenile hormone....
打磨木头的表面，为刷清漆做准备。Rub the surface of the wood in preparation for the varnish.这块木头的4个角刨过后就变小了。The piece was reduced in size by planing down the four corners.他无法确定地板是木头的还是石头的。He could not tell whether the floor was wood or s...