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。
MIT’s D “double bubble” series design concept is based on a modified “tube-and-wing” structure that has a very wide fuselage to provide extra lift.
麻省学院的D型“两个泡泡”系列设计概念基于改进过的“管状机身和一对后倾机翼”结构，机身更加宽大，可以提供额外的升力。
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。
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。
So don't forget you'll have to purchase extra pairs of 3-d glasses for each person who wants to watch the show.
所以别忘了你必须为每个想看戏的人额外购买一副3d眼镜。
Moviegoers at Baghdad's first 4-D cinema get an extra thrill from shaking seats and wind machines during a 3-D sci-fi film.
电影爱好者们在巴格达首个4D电影院观看3D科幻电影，观众可以通过影院提供的摇动座椅和风声器获得特别的感官刺激。
Why we like it: the perFORM [d] ance house is symmetrical pleasing with a modernistic style we think could become really popular - plus they get extra points for a disaster resistance.
推荐理由：perFORM [d]ance小屋外形对称，风格现代，我们认为很受欢迎。再说还有抗灾性能。
The Saudis are set to pump an extra 700,000 b/d and Kuwait, Nigeria and the United Arab Emirates may add another 300,000 b/d.
沙特准备增加700 000桶日产量；科威特、尼日利亚和阿联酋也可以增加300 000桶。
Avatar has the advantage of showing in 3-D (which usually commands an average $3 extra per ticket) and coming out when even 2-D movie tickets are more expensive than ever.
《阿凡达》能够拥有如此表现，应归功于昂贵的三维电影票价（通常平均每张电影票要高出3美元），实际上，如今即便是普通的平面电影也要比过去昂贵很多。
And I 'd like to add one extra item, if I may? Could we discuss the question of exchange procedures after item four, which looks at general payment conditions?
如果可以……，我想增加一条，我们能不能在第四项后讨论交易流程的问题，涉及大概的付款条件？
Stuffing your face like tomorrow is D-Day is probably much more unattractive than those extra few pounds of weight.
让你的脸看起来就像明天是诺曼底登陆日了，这样或许比超重几磅更难看哦。
I "d imagine the whole world was one big machine. Machines never come with any extra parts, you know."
我会把整个世界想象成一个巨大的机器，机器永远不会有多出来的零件，你知道的。
I "d imagine the whole world was one big machine. Machines never come with any extra parts, you know."
我会把整个世界想象成一个巨大的机器，机器永远不会有多出来的零件，你知道的。
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