seo 外

wài outside; in addition; foreign; external

链

liàn chain; cable (unit of length: 100 fathoms, about 185 m); chain (unit of length: 66 feet, about 20 m); to chain; to enchain

优

yōu excellent; superior

缺点

quē diǎn weak point; fault; shortcoming; disadvantage; CL:個|个[ge4]

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