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- Objective To study the efficacy of Chuangwei 10% emulsifiable concentrate against mosquitoes, flies and cockroaches. 目的研究创卫10%25杀虫乳油对蚊、蝇、蟑螂现场防制效果。
- Abstract : The effects of citric acid at different concentrations against dry rot in postharvest potato and the mechanisms were studied in this paper. 摘要： 研究了不同柠檬酸浓度处理对马铃薯干腐病的抑制作用及防御酶活性的影响。
- Buying a house is the best hedge against inflation. 购买房子是防止通货膨胀的最佳保障。
- Since the armed forces of the country as a whole are numerically strong,some of them should be used for frontal defence and some dispersed to carry on guerrilla operations,but the main forces should always be concentrated against the enemy's flanks. 若在全国军队，因其数量广大，应以一部守正面及以另一部分散进行游击战，主力也应经常集中地使用于敌之翼侧。
- The huge trees were profiled against the night sky. 在夜空的映衬下显出大树的轮廓。
- Since the armed forces of the country as a whole are numerically strong, some of them should be used for frontal defence and some dispersed to carry on guerrilla operations, but the main forces should always be concentrated against the enemy's flanks. 若在全国军队，因其数量广大，应以一部守正面及以另一部分散进行游击战，主力也应经常集中地使用于敌之翼侧。
- The PPV 7909 and PPV NADL-2 were grown on PK-15 cell lines, harvested and concentrated against polyethylene glycol 6000 overnight after freezing, thawing and ultrasonication as 80% Cytopathic effect (CPE) appeared. 本试验通过PK-15细胞增殖猪细小病毒(PPV)，待细胞出现80%25病变时，收获病毒细胞培养物，经反复冻融、超声波处理后，利用聚乙二醇6000浓缩病毒，葡聚糖G-200凝胶过滤的方法纯化病毒，得到了纯度较高的PPV。
- It's too hot to concentrate on book. 热得不能集中心思看书。
- I must concentrate my energies on decorating today. 我今天必须集中精力搞装饰。
- No one dared to speak out against the injustice. 没人敢对不公正行为表示公开反对。
- The forest will act as a defense against desert dust. 森林能起防御沙漠灰沙的作用。
- I can't concentrate on my work when I'm tired. 我累了就无法集中精力工作。
- The mayor is confident the war against crime will be won. 市长确信反犯罪活动之战争必定胜利。
- The ship beat back against a monsoon. 船逆着季风艰难地行驶。
- Don't put me off when I'm trying to concentrate. 我正要集中注意力呢，别打搅我。
- He lived over against the temple. 他住在那寺庙的正对面。
- We must concentrate our attention on efficiency. 我们必须把注意力集中在效率上。
- His eloquence did not avail against the facts. 他的雄辩在事实面前不起什么作用。
- She couldn't concentrate on a book very long. 她不能长时间专心读一本书。
- Ed spoke up against letting girls join the club. 艾德发言表示反对让女孩加入俱乐部。
