theorem of virtual displacement

例句：

1. 1.The theorem of virtual displacement states that the distance between two points in space is equal to the sum of their respective distances.
   虚拟位移定理表明，空间中两点之间的距离等于它们各自距离之和。
2. 2. In mathematics, a theorem is a statement that cannot be proved by any other mathematical proofs.
   在数学中，一个定理是一个不能通过其他数学证明来证明的陈述。
3. 3. The theorem has been proven to hold true for all real numbers greater than zero.
   这个定理对所有大于零的实数都成立。