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1·The married women of Shitamachi maintained the custom of blackening their teeth.

下町的已婚妇女保留了染黑牙齿的习俗。《柯林斯英汉双解大词典》

2·He is always blackening others' character by insinuation.

他总是含沙射影地贬低别人的人格。

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

春天时的一场野火横扫群山，使原本绿树成林的山头变得焦黑。

4·Even the Americans are guilty of blackening business's name.

甚至连美国人都对丑化商业负有责任。

5·If this product blackening a bit, do not affect usage effect.

本产品若略微变黑，不影响使用效果。

6·Behaviors of copper in blackening bath without selenium were studied.

对铜在无硒电化学发黑液中的行为进行了研究。

7·A new process of electroless blackening on aluminum alloy was developed.

开发出一种铝合金化学发黑新工艺。

8·Various factors affecting the blackening quality are analyzed and discussed.

对影响常温发黑质量的各种因素进行了分析和探讨。

9·A kind of the steel blackening agent performance satisfactorily was developed.

研制了一种性能优良的钢铁常温发黑处理剂。

10·Two step molybdenum-containing non-toxic blackening of iron and steel was described.

介绍了两步法钢铁钼系无毒常温发黑工艺。

涂黑

1·This custom is called the blackening of the bride, a very old Scottish tradition; some say even older than Sean Connery himself.

这种习俗被叫做“涂黑新娘”，是一个非常古老的苏格兰传统，有人说甚至比肖恩·康纳利(译者：老牌007那位？)他自己还要古老。