She gets sunburned even when she plasters herself from head to toe in factor 7 sun lotion.

即使她从头到脚涂抹上防晒系数是7的防晒霜，她也会被晒伤。

《柯林斯英汉双解大词典》

A sunscreen with a protection factor of 30 allows you to stay in the sun without burning.

一种防护系数为30的防晒霜使你能够待在太阳底下而不被晒伤。

《柯林斯英汉双解大词典》

Exposure to sun, however, is the one important risk factor that patients can do a lot about.

然而，黑素瘤的另一大致病因素，日光暴晒，则是病人们可以避免的。

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Look for sunglasses with an eye-sun protection factor (E-SPF) between 25 and 50, he said.

WSJ: The Crucial Years for Protecting Your Eye Health

They weren't cancerous, but she began using a sun-protection factor of 45 as part of her daily routine.

WSJ: The Myths of Daily Sunscreen

There are so far about 1, 000 candidate galaxies, some of which can out-shine our Sun by a factor of 100 trillion.

BBC: Supermassive black holes and hot galaxies in giant haul