Fruit and vegetables can be easily damaged, so they should be bought at the end, not the beginning, of a shopping trip.

因为水果和蔬菜很容易被压坏，所以应该最后买，而不是最先买。

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Fixing damaged knees is tricky because the form of cartilage found in the joints does not easily regenerate and in some cases total joint replacement is the only option.

修复受损伤的膝盖是一件很复杂的事情，因为关节上的软骨是很难再生的，在一些情况下对关节进行整体更换是唯一可行的办法。

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Alkali resistant but not acid resistant, and easily damaged by acid-containing substances.

耐碱不耐酸，酸性物质容易使其损伤。

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