Experimental study of the charring rate of tropical hardwoods .

热带硬木炭化率的实验研究。

The nailing strength of box nails for the commercial hardwoods .

箱用钉对商用阔叶树木材钉接强度之研究。

Both tend to make extravagant use of coffins made from valuable hardwoods such as oak and mahogany .

两种丧葬方式都常常过度使用由橡木或红木等贵重的硬木材做成的棺材。

I used to think hardwoods were hard and softwoods were soft .

我过去一直认为硬木家具就一定是硬的，软木家具就一定是软的。

Environment : making softwoods more durable could reduce the demand for unsustainably logged tropical hardwoods .

环境：让软木更加耐用能够减少对不可再生的热带硬木的砍伐。