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sludge before dam 坝前淤泥
The respirometric activities of sludge before and after tame have been determined by the BOD Track, and the activity could be expressed by first slope of respirometric curve. 采用BOD测定仪连续测定了驯化前后污泥耗氧曲线,采用第一段斜率表征污泥呼吸活性。并通过电镜观察驯化过程生物相的状况。
The procedure and results of field productive test for RCC of upper reservoir s subsidiary dam of Yixing Pumped Storage Plant before dam construction are described. 介绍了江苏宜兴抽水蓄能电站施工前进行的上水库副坝碾压混凝土生产性试验的过程和成果。
As a matter of fact, I've never been there before. 事实上我从未到过那儿。
We started early in order to arrive before dark. 为了在天黑前到达，我们很早就动身了。
The clerk marked up his daybook before going home. 办事员在回家前记好当天的日记帐。
Let's dunk in the pool before dinner. 我们饭前到池塘里泡一会儿。
I was inspired to work harder than ever before. 我受激励比以往任何时候都更加努力地工作。
The fox ran away before the hunter shot it. 那只狐狸在猎人向它射击前跑掉了。
Let's clean down the board before we paint it. 让我们在上漆以前把这块板洗干净。
It seemed an eternity before news of his safety reached her. 他平安的消息到达她那里之前，那段时间似乎是无限漫长的。
Let's collect the sap before its consolidation into a hard mass. 让我们在树液坚固成团之前将之收集起来。
I was roped in for this excursion before I knew it. 我不知不觉被拉来参加了这次远足旅行。
I want to catch forty wink before the guest arrive. 我想在客人到达之前，先打个盹儿。
Never before have I been asked to accept a bribe. 以前我从未被要求接受贿赂。
I adjure you to tell the truth before this court. 我要求你对本庭说实话。
It looks as if it will rain before long. 看起来一会儿就要下雨了。
He let a week go by before answering the letter. 他一周以后才回信。
He made a statement before the House of Commons. 他在下议院当众发表了一个声明。
I wiped my shoes on the mat before I came in. 我在进门前把鞋在垫子上擦了擦。