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- Hansen says a safe atmospheric concentration level was passed 20 years ago. 汉森说，大气密度的安全标准20年前就已超过了。
- In experiment 3, the roughage intake ad libitum by sheep was negativelycorrelated with concentrate levels in diet (r~0.95 1). 本试验还显示，绵羊饲喂精料量不同，对粗饲料的采食量却是一定值。
- Target analytes can be sampled form trace or small amount concentration level by using CUSDT SPME syringe. CUSDT固相微萃取管可以从痕量或微量浓度把目标分析物提取出来。
- In this regard, our annual average concentration level of RSP is comparable to those of the more polluted cities but not among the worst. 在这方面,我们的可吸入悬浮粒子含量水平,以全年平均计,与其他染情况较为严重的城市相若,但不在最差之列。
- To find the concentration level of organochlorine pesticides(OCPs) in surface dediments of Lake Nansihu,13 kinds of OCPs were detected by GC-ECD method. 利用气相色谱-电子俘获检测(GC-ECD)方法对南四湖表层沉积物中13种有机氯农药进行了分析测定。
- 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。
- At the end of the day, it would be stupid to suggest you need to measure the concentration level of a task and add one tablespoon of autopilot activities to create a multi-tasking mix. 当一天快要结束时，再建议你去衡量一件事情所需要花费的注意力，或是将勺子放入洗碗机以创建一个多重任务都是非常愚蠢的。
- I'd like a room on the upper level. 我想要楼上的房间。
- I can't concentrate on my work when I'm tired. 我累了就无法集中精力工作。
- Repeatability can also be evaluated with at least 6 measurement results when the concentration level of the analyte at 100%, the RSD of measurement results is the repeatability value. 应自样品制备开始制备6份样品溶液，所得结果的相对标准偏差即为方法重复性。
- Don't put me off when I'm trying to concentrate. 我正要集中注意力呢，别打搅我。
- We need a mechanical digger to level the ground. 我们需要一台挖掘机来平整土地。
- We must concentrate our attention on efficiency. 我们必须把注意力集中在效率上。
- The drug concentration of DPPC liposome is highest, it had a drug pinnacle descending slowly, and kept a high concentration level during a long time, the drug resorted in skin was most. DPPC脂质体药物浓度最高，它能使药物浓度很快达到高峰，然后缓慢下降，长时间内维持一个高的浓度水平，使药物在皮肤内的滞留量最大，时间最长。
- She couldn't concentrate on a book very long. 她不能长时间专心读一本书。
- I hope you'll be on the level with me. 我希望你对我坦率布公。
- She needs to win this point to level the score. 她要赢得这一分才能将比分扳平。
- I must concentrate upon my work now. 我现在必须集中精力工作。
- Keep a level head and phone the Fire Department. 保持冷静，打电话给消防署。
