The dark clouds hanging over the relations between the two countries will quickly vanish.笼罩着两国关系的阴云会迅速消散.All your troubles will vanish away when he returns safely.他平安回来后,你就无忧无虑了.If the circulation vanishes at one instant...
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.铜是电的良导体.Copper conducts electricity well....