“变硬”造句

在纸板上涂两三层清漆使其变硬。
Give the cardboard two or three coats of varnish to harden it.

这种材料需要有更高的温度和压力才能凝结变硬。
The material requires higher temperatures and pressures to set hard.

雪成冰后变硬了.
The snow hardened until ice was formed.