床垫用软木材架子支撑着。The mattress is supported on a softwood frame.用材树种有两大类 -- 软木材与硬木材.There are two main kinds of timber trees - softwoods and hardwoods.钉子很容易地就穿透了软木材.The nail easily penetrated the soft wood....

“软木材”的英语可以翻译为：soft wood，softwood ...