The presence of exogenous surface contamination, including dirt, grease, free iron from contact with steel tooling, and so forth, may interfere with the formation of the passive film.

外生的表面污染，包括：尘土、油脂、来自钢铁加工的游离铁等等，可以影响到钝化膜的生成。

youdao

There is a satyr on the later, standing behind her back and forth, and her physical contact.

有一色狼就过去了，站在她的身后，来回和她进行身体接触。

youdao

It is suggested in this paper that a kind of contact-free circuit for comparison and control should substitute for the conventional contact one in the back-forth wrapper web position control system.

提出在卷筒包装纸进退式光电定位系统中，采用无触点（全电子式）比较判别及控制电路，替代目前常用的触．点式同类电路。

youdao

My contact and his fellow directors flew back and forth between China and the UK in an effort to turn things around, but could not get a clear understanding of what was going wrong.

FORBES: B-school Boots on the Ground