He's wearing a knitted cardigan and his posture seems to indicate a very obvious calcium deficiency.

他穿针织衫，小身板很缺钙的样子。

White spots don't indicate calcium deficiency: Contrary to popular belief, those little white spots on your nails are usually due to trauma, not calcium deficiency.

4. 白点并不表示缺钙：与流行的看法相反，指甲上的那些小白点通常是由于外伤造成的，而不是缺钙。

There are a lot of myths about what causes these white spots: some people say they’re a sign of calcium deficiency, or maybe a zinc deficiency — but neither of those things are true.

关于导致这些白斑的原因有很多误解：有人说它们是缺钙或缺锌的征兆——但这些都不是真的。