Vitamin D made by the action of sunlight on the skin accounts for 90 per cent of the body's supply, but lower levels can also be obtained through food such as fish, eggs and breakfast cereals.

通过阳光刺激皮肤产生的维他命D可以提供人体90%的需要，但是其也可以通过鱼类，鸡蛋和谷类来提供。

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In the graph below, the bond market is at equilibrium at point a, at the intersection of the supply of bonds, s, and the demand for bonds, d.

下图所示，债券市场在债券供应s与债券需求d的交叉点A点处于平衡状态。

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OBJECTIVE: to observe the clinical effect of 5% D-fructose injectio on energy supply in surgery patients.

目的：观察5%果糖注射液用于手术患者能量供应的临床疗效。

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Should the United States now disrupt the British program due to its inability to supply D-5 missiles when and in the quantity called for by bilateral agreements, it could have a catastrophic effect on the viability of the U.K. Trident and severely strain relations between two key allied governments.

CENTERFORSECURITYPOLICY: Center for Security Policy | Congressional Efforts To Delete Funds For The Trident II: One More Step Toward Comprehensive, Unilateral US Disarmament

Of course, all of the files would be laced in DRM, and only users of NDS' system would be able to share and access the recorded content, but having a nearly endless supply of DVR'd shows at your disposal sure sounds appealing.

ENGADGET: NDS announces P2P-enabled DVR solution

D, subsidises the supply of prescription drugs by private insurers.

ECONOMIST: Health care costs