词汇	low head dam
释义	low head dam 低位差堰
随便看	activity to assist the impoverished students activity to popularize scientific knowledge activity trace activity tracker activity-tracker activity trail activity transient activity transport activity trap activity traps activity tree activity trend activity type activity under visible light activity unit activity unit design activity unit of thyrotrophic activity units activity validity activity value activity variable activity variance activity vector Activity Vector Analysis activity vector analysisAVA