Results The surface roughness of the gradual composite materials was significantly higher than that of the control materials(P<0.01).

结果梯度复合材料的表面粗糙度明显高于对照材料（P＜0．01）；

youdao

Control of fluid loss for a mud is achieved by several means, one of which is by addition of fluid-loss-control materials to the mud system.

可以通过几种方法控制泥浆滤失，其中一种方法是在泥浆中加入降滤失材料。

youdao

Its sand control effect is much better when high pressure filling is made along with sand control materials, hence increasing oil productivity and reducing recovery cost.

配合防砂材料进行高压填充，防砂效果更为明显，因此，提高了油井产量，降低了采油成本。

youdao

Yu said participating in PSI will help control North Korea's development of dangerous nuclear materials.

VOA: standard.2009.05.26

The minute control over materials made possible by 3-D printing could definitely make a difference in pre-fabricating materials for construction.

FORBES: MIT Architect Plans to Print Her Own Buildings

We are strongly supporting the International Atomic Energy Agency in its mission to track and control nuclear materials around the world.

CNN: Transcript of State of the Union

As work shifts to the Web, your files move out of your office and onto Google 's servers--and so does the control over those valuable materials.

FORBES: Magazine Article