For a few years its luminosity flared up to about 10,000 times the present-day luminosity of the Sun.

有几年它的亮度一度达到了现在的太阳亮度的一万倍左右。

《柯林斯英汉双解大词典》

A complete MK designation includes both spectral type and luminosity class -for instance, the sun is a G2V.

一个完整的MK系统代号包含光谱类型和光度型两部分——例如，太阳属于G 2 V类恒星。

youdao

When the Sun first became a main sequence star, it radiated only 70% of the current luminosity.

当太阳首次成为主序星，它的辐射只有当前光度的70％。

youdao

Looking even further ahead, the Sun will increase its luminosity by about 40% in three billion years.

BBC: Blue Marble Nasa

"I don't see much evidence that any of them have overdone it in the sun, " he says, recommending a tinted moisturizer for light but effective coverage and luminosity.

WSJ: Prime Time | Beauty's New HD-Ready Icons