Implant materials to be used as substitutes for high load-bearing bones need to possess not only bone-bonding ability but also high fracture toughness.

用于替换承受较大载荷的人体硬组织的植入材料，不仅应具有良好的骨结合能力，还应具有高的强度和韧性。

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Besides water, kids need plenty of calcium (钙) to grow strong bones (骨头), and milk is rich in it.

除了水，孩子们还需要大量的钙来发展强健的骨骼，而牛奶中含有丰富的钙。

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Bones need calcium and vitamin D to grow and reach their full strength.

VOA: special.2009.02.04

Professor Keyak says astronauts need to take preventative measures to keep their bones strong.

VOA: special.2009.03.10

When levels are high, it suggests that bones need more calcium to grow.

CNN: Vitamin D deficiency common in U.S. children

In her first week at medical school she collects the box of human bones she will need for her anatomy studies, taking it to the pub so she can boast to everyone that she is a real trainee doctor.

ECONOMIST: A surgeon's life

And dense bones are something women really need to strive for, given our propensity towards brittle bones, or osteoporosis, especially as we age.

CNN: Stay wise about weight as you age