“变弱”用英语怎么说

在森林中, 潮湿的树木与针叶会使讯号变弱.In a forest, wet wood and needles attenuate the signals.小孩睡羽绒床身体会变弱.A feather bed enervates the body of a child.他的心跳渐渐地变弱.His heart beats were getting weaker....