People over age 50 need extra vitamin D because, for one thing, our skin becomes less able to make vitamin D as we age.

超过五十岁的人需要补充维他命D，因为，一方面，我们的皮肤随着年龄的增长，合成维他命D的能力也慢慢下降。

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One of Gliese 581's planets, planet d, could be one of these "eccentric impostors," hiding an extra planet within its signal.

葛利斯581的一颗行星——行星d——就有可能是这样的一个假冒者，它的信号可能就隐藏了另外一颗行星。

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Even those who criticized the story conceded that the film looked great and was well worth the extra money for the 3-d ticket.

即便是那些批评影片情节的人也承认，这部电影的视觉效果极其出色，为3d而支付的额外票价绝对物有所值。

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First we have the "Pilot of some small night-founder'd Skiff," and the pilot stands ab extra, from outside, in the simile.

首先我们有这句“迷茫深夜中，轻舟的导航人“,并且这个导航人在明喻中，体现为从诗句之外向内眺望。

耶鲁公开课 - 弥尔顿课程节选

If you'd like an extra shot of flavor, flame the fruit with port, kirsch, dark rum or amaretto.

NPR: Holiday Sweets: On the Road (and in the Mail)

You'd pay for that extra coverage, of course, but then you'd have the reassurance that the HMO's interests and yours are better aligned when the review board gets your application for a marrow transplant.

FORBES: Magazine Article

None of this proves that taking extra vitamin D will help healthy people.

FORBES: D Is for Debate