Part of the roof had rotted away and the exposed plaster was beginning to crumble.屋顶的一部分已经朽烂，暴露的灰浆开始脱落。His hair is thinning and his skin has lost all hint of youth.他的头发开始脱落，皮肤也老化了。A side effect of the treatment is that your hair starts to fall out.这种治疗的一个副作用是头发开始脱落。