Gear lubricants may congeal and channel in cold weather.

天气冷时齿轮润油可能凝结而形成凹。

Sliding doors and windows move in groove.

门和窗都凹中移。

Owing to the construction of body, it might be hard to bestud acrylic into gorge and won't loose it.

由于结构关系，要使压克力板能够完全嵌合原先凹上而不脱落，会有一些困难。

The grooved head of the sprue puller creates an effective undercut which is used to pull the sprue, or secondary sprues in underfeed designs.

主流道拉料杆头部凹形成了一个有效底切，可以用来拉出主流道或者是下进料设计中二级主流道。

The glass bottle is clear at the bottom, graduating into black towards the all-black cap.Crystal droplets are engraved on the back of the flacon, which was designed by French sculptor Serge Mansau.

前天看到水晶灯版视频，相当梦幻，今天拿着瓶灯下细看，左边照片上凹，确实美仑美奂，很像水晶珠串，光真是神奇。