不常的

According to the Environmental Protection Agency, shark, swordfish, king mackerel, and tilefish contain the highest levels of mercury.

有数据显示，每星期吃几次葡萄柚的女性会比那些不常吃葡萄柚的女性增加30%罹患癌症的危险。

Finally, for the moving boundary problems of the flow field, the irregular and time dependent physical space is mapped into the regular and time independent numerical space.

在数值空间中的非定常流场，其空间域是简单规则的，边界是固定不变的。

The paper implemented the output regulation of a class of nonlinear systems under a supervisory control scheme. The process is a strict-feedback structure system with uncertain constant parameters.

摘 要：在监督控制方案下实现了一类非线性系统的输出调节，过程是全局Lipschitz的严格反馈形系统，含有不确定的定常参数。

If pairs of substations are connected through a secondary tie circuit breaker, the result is a secondary selective system.

常情况下，变电站的运行与放射式系统相同。如果变电站在切换时可以并联，则一次馈电线、变压器和二次侧主断路器的检修，可能在只需要短时间停电或不停电的情况下进行。然而检修整个变电站时则需要停电。

It is true, and less often remarked on, that space raises philosophical questions that have no temporal analogues—or at least no obvious and uncontroversial analogues.

虽然不常被注意到，也能够针对空间提出一些问题，但没有针对时间的相似问题，或至少，没有明显的无争议的类似问题。

There is always a saying goes like that: The best is always the unpossessed.

所以也常有这样的一句话"得不到的东西永远是最好的"。

Then start by leaving an unset trap covered with a large towel during routine feeding so that the cats will get used to seeing and smelling it in the area.

然后藉由让一个不固定的圈套开始在常式期间以一条大的手巾复盖逐渐强烈的以便猫将会在区域中习惯于见到而且闻它。

A theoretical study on mechanism of mass and heat transfer was carried out based on several assumptions, namely one dimensional steady flow and non condensable gas in the air gap.

采用一维定常流动及空气间隙层中不冷凝的假定，对空气隙膜蒸馏系统的传质传热机理进行了理论研究，数学推导中对相关物理量进行了量阶分析，提出小量假设，导出了计算蒸馏通量的理论公式。

We show a fully automatic method of mining collocates from scientific texts in the protein and gene domain and applying collocates to filter out unlikely protein/gene candidates.

在实验中，我们可以自动的探勘出常和基因出现的词语，并应用於过滤不可能的基因候选者。

Designating a differential equation containing no more than two variables and derivatives of one with respect to the other.

常的为微分方程设计的，该方程的变量不超过两个且一个对另一个进行求导

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。