Lack of vitamin D is another factor to consider.

缺乏维生素D是另一个需要考虑的因素。

《柯林斯英汉双解大词典》

She said that the use of sun creams and moisturisers with a sun protection factor also reduces UV absorption and so vitamin D production.

她说，使用含有防晒因子的防晒霜和保湿露也能减少紫外线的吸收和维生素D的合成。

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Set D as non square factor positive integer.

设D是无平方因子正整数。

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Speaking of the sensor, we got a chance to do a brief comparison between the A99 and Sony's RX1 compact that packs the same full-frame CMOS. As you can see in our sample shot, the sensor does its job regardless of form factor -- you'd be hard pressed to determine which pictures were produced with the DSLR and which came from the compact camera.

ENGADGET: Sony Alpha A99 DSLR sample shots and video, plus comparison with the RX1 full-frame compact

Kim then shifts into sales-mode by pointing out that Samsung's more power-efficient 240Hz LCDs and Plasmas with highly-reflective black panels and LED edge-lighting are quickly cutting into any advantage offered by OLEDs -- including thinness if you factor in the additional electronics you'd have to slap onto the back of those 3-mm thick OLED panels to create a TV.

ENGADGET: blogger-avatar

In fact, the Army's "D factor" data showed how few non-white personnel there were.

BBC: NEWS | UK | Army restricted ethnic recruits