weight of unknown

例句：

1. 1. The scientist calculated theweight of the unknown object.
   科学家计算了未知物体的重量。
2. 2. The engineer had to determinethe weight of the unknown material.
   工程师必须确定未知材料的重。
3. 3. The weight of theunknown object was a mystery that needed tobe solved.
   未知物体的重量是一个需要解决的谜题。