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But CN strain seldom killed human normal cells 2BS.

其中尤以HEP3B细胞最敏感。

objective to evaluate clinical effect of the handling protaper nickel-titanium rotary instruments in preparation of canals of posterior teeth.methods 96teeth with pulpitis or periapical periodontitis were instrumented by handling protaper rotary instruments using step-down technique,and by k files using step-back technique for control.all teeth were obturated with lateral condensation methods.the efficiency of preparation was analyzed with ra-diographs before and after operation.results no transportation,apical blockage and ledge were found in test.the technique could keep canals smooth.there were two ledge,one instrument fracture and nine transportation in control.the operative time was shorter and post treatment pain seldom occurred in handling protaper group.conclusion the handling protaper niti rotary instruments can prepare the canals effectively and safety.after the preparation,the canals could be easily washed,sterilized and filled.it is an efficient instrumentation method for posterior teeth's canals and be used widely.

目的 评价手用protaper预备后牙根管的临床效果。方法选取患有牙髓炎和根尖周炎的后牙96例，随机分成试验组和对照组各48例，试验组用手用protaper多锥度镍钛旋转器械逐步伸入法预备根管，对照组用k锉，逐步后退法预备根管，两组均用侧向加压充填法充填根管，根据治疗前后的x线片，评价后牙根管预备效果。结果试验组无根管偏移、根尖阻塞、台阶，且根管壁平滑流畅，无器械折断等并发症发生。对照组有2例台阶形成，器械折断1例，根管偏移9例。试验组操作时间短且术后疼痛轻微。结论应用手用protaper预备后牙根管快速、安全，成形效果好，易于根管冲洗消毒及填充，可视为临床上预备后牙根管的有效方法。

Now quick people of society circadian rhythm earns money , works to be bustling about, almost return to even if being that the family refers to above also seldom in 1 year, often be to need to have celebrated the New Year running just now to home, the annual queen answers society in a hurry, but year-end family reunion dinner has been accomplished communicate with the family the most important activity in 1 year.

现在社会生活节奏快人们都忙着挣钱、工作，就算是家人一年之中也难得见上几回，经常是要过年了才往家里跑，年后又匆匆回社会，而年夜饭就成了一年之中与家人沟通最最重要的活动。

It was perhaps the first time Zhu Wei had delved deep into things he seldom touches on in ordinary life, and I discovered a passion in him for the expression of feelings hidden underneath his linguistic simplicity and self-repression.

西方人喜欢说性格即命运，其实很多人并不知道该如何对待命运，朱伟从来不炫耀他的业绩，从来不抒发他对未来图景的宏大构想，用他自己的话说，只像一个勤劳的农民，踏踏实实地埋头劳作。

The self-heating effect in power GaAs MESFETs is significant, but it is seldom discussed in detail in other models.

此外，各个电荷源的总电荷量为零，确保了模型在直流条件与射频条件下的一致性。

They were seldom, if ever, paid.

他们很少，如果有的话，支付。

It is seldom that you will ever have three consecutive losses.

很少会出现连续三次的亏损的。

We see them very seldom,if ever.

我们难得见到他们。

She seldom if ever goes to his house.

她很难得地去了他家。

We seldom ever had to go to the store.

我们很少购物去商店

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐