Issuing European bonds would not lower a country's overall debt, but only change its composition.
发行欧洲债券不会降低一个国家的总体债务水平，而只是改变了其债务的结构组成。
We can only speculate at the core composition of mercury, but it has a very high density for its radius so it is likely to have a large metallic core accounting for most of its mass.
我们只能推测在汞的核心成分，但它有它的半径密度非常高，所以很可能有一个大的金属的群众最核心的会计。
Light could influence not only the lipids content of the cell but also its fatty acids composition.
光强不仅影响藻体中类脂的含量，而且影响着各种脂肪酸在总脂肪酸中的比例。
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