一定的

Among the sixteen experimental fishes, they can parasitize and metamorphose successfully on only 5～6 fish species.

实验表明：该幼虫对寄主鱼有一定的选择性，在所试16种鱼中，幼虫只能在5种鱼体上成功地寄生，并变态为幼蚌。

In order to get anywhere - either literally or metaphorically - we need to create and maintain a certain level of momentum.

为了达到某个地方--不管是从字面意思上--我们都要激发或者保持一定的动力。

A simulation result os given to demonstrate the feasibity of the improved method of the improved method for iteration calculation.

结果表明该方法可有效改善迭代计算，具有一定的优越性。

Objective:To study the method for the determination of chloramphenicol residues in aquatic products by ECD gas chromatography.

氯霉素(chloramphenicol，CAP)为广谱抗生素，由于其副作用大，在用于人类治病上受到一定的限制。

Today's cybercriminals methodically seek to exploit the most computers in a given amount of time.

如今网络罪犯会有条不紊地是在一定的时间试图入侵多数电脑。

The size of microalloyed carbides is very small and some is only 2~3nm. So microcrack extending can be restrained.

并且，由于微合金碳化物尺寸很小，可达2～3nm，对于微裂纹扩展有一定的约束作用。

From the infrastructure, our country's cities are middling and hold definite base to compete.

从基础设施看，我国城市居中等水平，具有一定的竞争基础。

I am mildly pleased when they appear to like me and undisturbed if I know they don't.

要是他们看来还喜欢我，我有一定的高兴；要是我知道他们不喜欢我，我也不以为忤。

The results show that: Rhizome of Oldworld Arrowhead., water lettuce, and Brazilian milfoil. have a normal growth in eutrophicated water, and they also have a certain degree of purification capacity.

结果表明：慈姑、大薸、穗状狐尾藻在供试富营养化水体中均能正常生长，对富营养化水体均有一定的净化能力。

This achievement has certain reference value and directive significance to mining engineering.

该成果对采矿工程具有一定的参考价值和指导意义。

Since historical times,England ,where the early inhabitants were Celts, has been conquered three times .

从有历史以来，英国，在此地早期居住的是凯尔特人，已经被征服了三次。

Bluetooth OBEX File Transfer Enables the sending and receiving of files on your phone via Bluetooth.

蓝牙OBEX文件移动允许经过蓝牙传送和接受文件。。。。