我们多年来都开着一辆生锈的旧货车四处旅行。We spent years travelling around in a rusty old van.闪电在货车周围炸开时，情景异常壮观。It was unbelievably dramatic as lightning crackled all round the van.马撞在货车上发出砰的一声巨响。There was a loud thump as the horse crashed i...
It acts as a catalyst in the process of fermentation.它在发酵过程中起触媒的作用.The process, in which the tea develops its characteristic astringency, is known as fermentation.茶开始散发涩味的过程称作发酵。Sugar is added to the wine during fermenta...