当...时

The radical scavenging activity of Laminaria japonica pigments was studied by the DPPH2,2-Diphenyl~(-1-picrylhydrazylassay. The total pigments showed a strong DPPH radical scavenging activity of 65.819% with the concentration of 0.52mg.ml~(-1). The DPPH radical scavenging activity of fucoxanthin was 19.85% with the concentration of 0.27mg.ml~(-1). The antimicrobial activity of pigment in Laminaria japonica was studied by the method of round paper. The results showed that the pigment extracts have activity against Escherichia coli, Pseudomonas aeruginosa, Saricina flava and Saccharomyes cerevisia. The antibacterial activity of total pigments for Saccharomyes cerevisia was the strongest with an inhibition diameter of 18.9 mm; and the antibacterial activity of fucoxanthin for Saricina flava was also much significant with an inhibition diameter of 10.2 mm.

测定了它们对自由基的清除率和对四种细菌的抑菌效果，研究结果表明，总色素和褐藻黄素的浓度与自由基清除率成正比，当总色素浓度为0.52mg.ml~(-1)时，清除率达到65.819%，高于陆生植物黑米色素和紫甘薯色素；当褐藻黄素浓度为0.27mg.ml~(-1)时，自由基清除率达到19.85%，低于紫苏色素、紫甘蓝色素、黑米色素、紫甘薯色素；对大肠杆菌、绿脓杆菌、八叠球菌、金黄葡萄球菌的抑菌实验结果显示，海带总色素对金黄葡萄球菌的抑菌活性最强，抑菌圈直径为18.9mm；褐藻黄素对八叠球菌的抑菌活性相对较强，抑菌圈直径为10.2mm。

The howitzer has a maximum firing range of 22km when using the NORINCO Extended-Range, Full-Bore, Hollow-Base round, or 27km when using the NORINCO Extended-Range, Full-Bore, Rocket-Assisted round.

当使用中国北方工业总公司增-程，全内径，空心-底排弹药时最大射程22公里，或当使用中国北方工业总公司增-程，全-内径，火箭助推弹药时27公里。

The results showed that when the concentration of Pb(superscript 2+) was lower than 400 mg/L, effect on the germination root length, bud length, root weight, bud weight, the root activity and the proline content of the garden balsam were not obvious.

结果表明，当Pb(上标 2+)浓度低于400mg/L时，对凤仙花种子的发芽率、发芽势、幼苗的根长、芽长、根重、芽重、根系活力及脯氨酸含量影响不大，当Pb(上标 2+)浓度为800mg/L时，对凤仙花种子才开始表现出明显的抑制作用。

To overcome the difficulty caused by the fact that the Lax pair depends on thesolution of the equation as |k|→∞,we write the Darboux matrix with N-poles inthe form:〓,where factor 〓 is a gauge transformation which isindepent from k and 〓 tends to the unit-matrix I as |k|→∞.

为了克服当|k|→∞时，Lax对仍依赖于方程的解所引起的困难，我们把含N对极点的Darboux矩阵〓分解为两部分：〓，其中〓为与参数k无关的2×2矩阵，它相当于一个规范变换。而〓当|k|→∞时趋于单位矩阵I。

But when he was mentioned as a possible candidate for president in 1972, he demurred; and when the Democratic nominee, George McGovern, offered him the vice-presidential nomination, Mr. Kennedy again said no, not wanting to face the inevitable Chappaquiddick questions.

当人们把他当做1972年准总统候选人时，他表示反对；当民主党候选人乔治麦高文提出让他作为副总统候选人时，他再度拒绝，说他不想在面对关于查帕奎迪克岛的问题，而他若是参选，这类问题将不可避免。

Obama, the son of an anthropologist, offers gnomic observations about the political process (interestingly, he admires Ronald Reagan), keeps his head when those around him have lost theirs and retains his likeability throughout, even when complaining that all media scrutiny reminds him of a "public colonoscopy."

作为一位人类学家的儿子，奥巴马对美国政治具有深刻精确的观察分析（令人感到有点儿意外的是，他竟然十分推崇罗纳德·里根），当周围的人头脑混乱时，惟有他自始至终保持着清醒的思维，并一直很好地维护着自己的良好形象，即使当他抱怨媒体时时刻刻盯着自己，感觉就像"大庭广众之下接受结肠镜检查"一样时，他也没有失态。

When work is a pleasure ,life ia s joy ,Whne work is duty ,life is slavery,---golgi

当工作是一种乐趣时，生活是一种享受，当工作是一种义务时，生活则是一种苦役

When the sences of all comes,death takes the master in its enbrace and his body is laid away in the cold ground,no matter if all other friends persure their way,there,beside the master's graveside,will the noble dog be found.

当死亡降临时，主人的身体已经被深埋与冰冷的地下时，当所有的朋友都各奔东西时，在那人的墓旁，你仍会发现那只高贵的狗的身影。

When you find yourself needing the phrase This is like "Groundhog Day" to explain how you feel, a movie has accomplished something.

当你发现当你需要表达一些你的感受时，你不得不借用它，例如"土拨鼠日"，来阐释你的观点时，你就会回味出它的妙不可言了。

Furthermore, it is clear that when carrier signal h=0, closed loop PWM DC-DC converters are not well-posed and when some condition is satisfied, closed loop PWM DC一DC converters with P controller are well-posed.

然后利用该结果对PWM型DC-DC降压变换器的适定性的研究表明当载波信号h=O时闭环PWM DC-DC 变换器总是不适定的，当载波信号h的参数和比例控制器的参数满足一定的条件时，比例控制的闭环PWM DC-DC变换器是适定的。

And discuss some key point of integrated management system design, include hazard identification and risk assessment and risk control in the occupational health and safety management, the measure of satisfaction target of customer, the flawlessness of law system, the integration of the integrated management system and enterprise standardization system, unify lead institution and work orgnization, integreted internal audit and integrated management review.

同时，论述了一体化管理体系构建中的几个主要问题，包括职业健康安全管理中的危险源辨识、风险评价和风险控制、顾客满意度的科学监测、法律、法规体系的完善、一体化管理体系与企业标准化体系的有机结合、统一的领导机构和工作机构、一体化的内部审核和管理评审。

Deepwater Taranaki is investigated for its petroleum potential, using all available seismic data tied to shallow-water wells.

运用与浅水井相关的现有全部震波探测数据考察了深海区塔拉纳基盆地的油藏前景。