This time only use the right hand. Mask away the rest.

这次只使用模特的右手，将其他部分遮蔽掉。

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Add a layer mask to this layer as shown below, this will create a better lighting contrast for the hand and make this overall image look better.

按照下面的样子，添加一个图层蒙版，这样可以给整个画面增加整体光的对比度，画面看起来会更好一些。

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On this second approach the F-8 pilot was observed to have his oxygen mask removed and was seen gesturing to the crew with hand signals in a pushing motion.

在其第二次接近时，歼8飞行员被看到摘下氧气面具，并被看到正在向机组人员作一个向前推进的手势信号。

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Now you will remember that the mask Comus was everywhere well, the strangely intertwined questions of the power of chastity on the one hand and the power of poetry on the other.

你们应该记得，面具戏《科玛斯》处处都,一方面是贞洁的力量，一方面是诗歌的力量,这两股奇特的纠缠在一起的力量。

耶鲁公开课 - 弥尔顿课程节选

For this reason, he adds, there remains no scientific evidence that widely promoted protective measures such as hand washing and mask wearing will actually stop people from getting sick.

CNN: Study: Humidifiers may help fight flu

Signs posted throughout the hospital discourage anyone from visiting who has a cough or fever, she said, and anyone who does visit with those symptoms must wear a mask and perform hand hygiene.

CNN: STORY HIGHLIGHTS

He was holding a knife in his hand and he was wearing a mask.

BBC: Elswick knifepoint rapist Abdul Miah jailed for 12 years