harden the clay 使黏土变硬
harden one's heart 使心变冷酷
harden into solid 凝固成固体
1. The sun hardens the mud.
阳光使泥土变硬。
2. His heart hardens with each disappointment.
随着每一次失望，他的心都变得更加冷酷。
3. The wax hardens as it cools.
蜡在冷却时会变硬。
A: Does this clay harden quickly?
A：这种黏土变硬得快吗？
B: Yes, it hardens within an hour.
B：是的，它在一小时内就会变硬。
1) 使变硬
2) 变得坚定
3) 变得冷酷
1. 使变硬或变坚实
e.g.
The mixture hardens quickly.
混合物很快就会变硬。
2. 变得冷酷或顽固
verb
1. to become or make something hard or firm
Synonym: solidify