blackening造句怎么写

Wearing masks and other disguises and blackening the face with soot were originally ways of hiding oneself from the spirits of the dead who might be roaming around.

The existing methods of zinc plating blackening by black passivating, coloring, dyeing, etc. are studied, and the high resistance to corrosion of the passivator is highlighted.

a disease blackening the leaves of pear and apple trees.

The influence of ammonium molybdate, cobalt sulphate, ammonium bifluoride, acidity of blackening bath, blackening bath temperature and time on film quality were studied.

A newly developed high efficient degreasing and rust removing solution for pre blackening treatment of high strength bolt is presented.

Said product possesses of fairly good actions of style keeping, nourishing hair, blackening hair and features convenient for use, no need of electric blowing and without inflammable danger.

The said liquid consists of blackening liquid and phosphatization liquid.

Black phosphating of iron and steel is a new surface treatment process made a feature of using HHS blackening additives.

The married women in the village still keep the practice of blackening their teeth.

In the spring fire swept across the hills, blackening them.