inverted single bevel edge screw 倒背单斜边螺纹
inverted edge
倒边
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The gradual brightening towards the Sun's edge in this color-inverted image, called limb darkening, is caused by increased absorption of relatively cool solar gas.
朝向太阳在这颜色倒影，称为边缘变暗，是由相对凉爽气体增加惹起的太阳能接收边缘逐突变亮。
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