The dry weights of root, stem, leaf and spike coubld be described as S curves either.
荆芥株高、茎径变化动态，根、茎、叶、穗干重积累动态均呈不同特征的“S”形曲线。
2
It 's not absolutely clear what is causing the spike. Fidelity points to two possible reasons.
到底是什么引起了此类人群的增长，目前还不是很清楚。富达公司指出了两个可能原因。
3
Just how many Iraqis would die if the U. S. withdrew is anyone's guess, but almost everyone who has studied it believes the current rate of more than a thousand a month would spike dramatically.