令人难解的是, 他竟一直保持沈默.Unaccountably, he kept silent.脚注阐明了文中难解的段落.Footnotes illuminated the difficult passages of the text.有些谜语看似难解，可一旦知道了谜底其实十分简单。Some puzzles look difficult but once the solution is known are actually quite s...
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....
当她把烟吸进肺里时，她的双颊瘪了下去。Her cheeks hollowed as she drew smoke into her lungs.他吸进冰冷的空气。He breathed in the frosty air.我们抬起头,吸进新鲜 、 干净的空气.We lifted our heads to breathe in the fresh, clear air....