本论文以落叶松单宁为原料研制含阴、阳离子基团的落叶松单宁两性水处理剂。
Preparation of larch extract tannin amphoteric water treatment agent has anionic and cationic group by use of larch extract tannin was studied.
这些迷路的孩子们在一些落叶下挤成一团以保持温暖。
The lost children were huddled together under some fallen leaves, keeping warm.
以蛹在向阳地的残株落叶或杂草中越冬。
It over-wintered with the pupa in fallen leaves or the weeds of ground.
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