A. Telomeres are the protective caps at the ends of chromosomes in cells.

端粒就是细胞内的染色体上的一个保护罩。

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Replace any valve outlet and protective caps originally shipped with the cylinder.

替换最初同钢瓶一起运输的阀门排气口和保护帽。

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Our DNA is carrying chromosomes and at each end of these, a sort of protective caps called telomeres.

我们的DNA携带染色体，在每条染色体的末端都有保护性的端粒。

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United mechanics who inspected the engine found that two shop towels had been used to cover openings in the oil sump area, instead of protective caps.

CNN: US Airways, United face FAA fines for safety violations