Skin color, where you live and how much skin you have exposed all affect how much vitamin D you can produce.

皮肤颜色、生活地点和暴露在外的皮肤面积大小，都会影响你的身体所能产生的维他命D的量。

youdao

Although we talked about Vitamin D and sunlight, it can make a huge difference in how you feel if you go to a tanning salon to get some light on your skin.

尽管我们已谈到维生素D和阳光，但是如果你刻意去参加日晒沙龙来摄取阳光到皮肤的话，它会让你感觉到巨大的差别。

youdao

So how much is enough vitamin D?

这样人体要获得多少维他命d才算够了呢？

youdao

"What's very interesting about vitamin D is that it's involved all throughout the body, and it's involved on a local level, so you can have vitamin D active in the breasts, in the prostate,in the colon, and it's thought that the locally-acting vitamin D is helping to protect the body against these cancers, regulating how cells grow and how cells die."

VOA: standard.2010.05.28

Look at line 119: Blind mouths! that scarce themselves know how to hold A Sheep-hook, or have learn'd aught else the least That to the faithful Herdman's art belongs!"

看一下第119行：,妄言之口！他们甚至不知如何掌控,愚钝之人，从未经受过学识的洗礼,文艺只属于虔诚的牧人！

耶鲁公开课 - 弥尔顿课程节选

It'd be actually much more valuable for you to know how to ; right?--if you're getting along in Western civilization; or how to use computers,or sexual technique, or how to speak other languages.

懂得如何修车,对吗，如果你要融入西方文明;,还要懂得如何使用电脑，性技巧，说一门或多门外语。

耶鲁公开课 - 新约课程节选

It turns out that sending on-line how-d'ya-dos is one of the biggest draws on the Web.

FORBES: E-Sentiments, Exactly

The bottom screen is 3 inches and is a touchscreen, like that of the Nintendo DS. A 3-D depth slider on the right side of the top screen lets you control how much 3-D effect is shown, from completely off to fairly deep 3-D.

FORBES: With 3DS, Nintendo Pulls An Apple

Dr. Snyder may have found one in his serendipitous discovery of how D-serine functions.

FORBES: Repairing The Brain