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....
Motorized wheelchairs are a rarity here.电动轮椅在这里很罕见。The building has been specially designed to provide easy access for people in wheelchairs.这幢房子特地设计得便于坐轮椅的残疾人进出.Men in wheelchairs reeled around the room, shouting and si...