必要时

Phytopathogenic bacteria employ Hrp pathogenicity island to encode a specific typeⅢsecretion system that is required for bacteria and host plant interaction.

植物病原细菌利用Hrp致病岛编码专化性的Ⅲ型泌出系统，这个泌出系统是细菌与寄主植物互作时必要的调节因子。

They have argued that force must sometimes be used preventively, and that they must be free to decide when their national security requires it.

宪章》第八十一条重申&联合国会员国受武力攻击时，在安全理事会采取必要办法，以维持国际和平及安全以前，行使自卫之自然权利&。

The proposed algorithm consists of forbidding unnecessary triggers for the inverter switches and do not need any additional circuits and off-line experimental measurement. The realization of algrithm is very simple, the harmonics in output waveform are small, and the algrithm resoves the pulsant when the system works at the low frequency. The proposed algorithm was applied to a PM synchronous motor drive system.

该算法可以省掉开关器件没有必要的开通和关断，不需要任何额外的硬件电路、离线的实验测量，算法实现简单，输出波形谐波含量小，较好地解决了系统在低频时输出电流的脉动；适用于永磁同步电机。

And if the citizens again feel free, the repressive government will have no reason to exist, and we can refashion a more just society.

当人民重获自由时，这个残暴的政府就没有存在的必要了，那时我们就可以组建一个更加公平的社会。

It is demonstrated that the frequency drift will break up the phase-locked state of the laser array and induce the spatial instability of the far-field intensity due to phase noise. It is also found that although the evanescent coupling between elementary lasers can restrain these effects to some extent, the restrainability is too limited to be effective when the frequency drift is relatively strong.

通过对耦合激光器阵列动力学方程的数值研究发现，频率漂移将破坏激光器阵列的锁相状态，并引入相位噪声，导致输出远场光强分布不稳定；研究还发现：倏逝波耦合能够对频率漂移的影响起到一定的抑制作用，但这种抑制只在频率漂移较弱时才有效，因此，如果将该阵列用于光束合成，加入相应的抗干扰措施还是很必要的。

DEAR ABBY: When I saw the letter from "Roseless Rosie", the happily married woman who complained

亲爱的艾比：当我看到&没有玫瑰的罗茜&，一个拥有幸福婚姻的女人，在信中抱怨她丈夫总是不记得&重要的&日子时，我觉得自己有必要写几句。

This is all that is needed to render Asian text and to allow for rotated fonts.

在渲染亚洲语言文本时，垂直方向的文本绘制是必要的，同时字体旋转也应该被考虑。

This is all that is needed to render Asian text and to allow for rotated fonts.

在渲染亚洲语言文本时，垂直方向的文本绘制是必要的，同时字体旋转

The ideal workplace provides employees with empowerment and direction when needed , but shies away from unnecessary micro management .

理想的工作场所的规定，雇员与赋予妇女权力和方向，有需要时，但回避不必要的微观管理。

Notice:There is a length of slubby shape on the both sides of slubby length and when the slubby length is long,it can be ignore,but when the length is short, you should take it into account.

该公式的注意点：节长两端有一段节形长度，当节长较长时可以忽略，如果节长较短时有必要考虑进去。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。