To facilitate carrying, rope or metal handles are indispensable and should be fixed to the boxes.
为便于搬运,绳子或铁把手不可缺少,并将其固定在箱子上。
Over the periods their saliva, a mild, digestive juice like our own, was converted into a poison that defies analysis even today.
蛇的唾液本来和我们人的消化液一样柔和,但经过漫长的时间,演变成了今天仍无法分析清楚的毒液。