木头不是良好的导体。Wood is a poor conductor.铜是热和电的良导体.Copper is a good medium for the conduction of heat and electricity.木头是热和电的不良导体.Wood is a poor conductor of heat and electricity....
You don't have to go running upstairs every time she rings.用不着她一来电话你就往楼上跑。They actually moved down from upstairs because the rent's that expensive.他们确实从楼上搬到了楼下，因为房租太贵了。She climbed the steps and proceeded along ...
身体浸入水中就会明显减轻重量.When a body is immersed in a fluid , it apparently loses weight.那个大男孩将游泳池中所有的小男孩都短时浸入水中.The big boy ducked all the small boys in the swimming pool.他把头浸入小溪来使自己凉快.He ducked his head in the stream to get cool...