1. With the temprature cool, magma would be hardened into rock. 温度越来越低,岩浆也就变硬,最后成了岩石。
2. Why shall harden steel be annealed? '淬火'。''钢为什么要退火呢?
3. A battery of simulation tests helps harden combat soldiers into the Empire's elite armor assault crews. 一系列的模拟训练让战斗兵更加顽强,以进入帝国的精英装甲突击部队。
英英解释
v.
1. become hard or harder
2. make hard or harder
3. harden by reheating and cooling in oil
4. make fit
5. cause to accept or become hardened to; habituate