相似 (xiāng sì) means “similar; alike”. It is an HSK 5 Chinese word in the HSK 3.0 vocabulary.
这两个品牌的手机在外观上非常相似,很难区分。
Zhè liǎng gè pǐnpái de shǒujī zài wàiguān shàng fēicháng xiāngsì, hěn nán qūfēn.
These two brands of phones are very similar in appearance and hard to distinguish.
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