HSK 4
偶尔
ǒu’ěr副形
occasionally; once in a while; sometimes
爸爸偶尔坐地铁去上班。
Bà ba ǒu ěr zuò dì tiě qù shàng bān.
Dad occasionally takes the subway to work.
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New in the HSK 3.0 word list at level 4.