He had planted Dr. Williams's quick-growing seedlings in it, but none of the stems were showing.
他把威廉姆斯博士的速生幼苗种在了里面，但没有一个茎干露出来。
2
There is necessity and possibility to accelerate the exploitation of quick-growing trees for papermaking.
加速开发速生材造纸，既有必要，也有可能。
3
Based on the chemical composition analysis of the quick-growing triploid aspen, we can conclude that it is more appropriate to be used as a raw material for papermaking than straws.