27.大拿（dà ná）
Expert; able person
例：他在烹饪方面可是个大拿。
He is an expert in cooking.
28.单挑（dān tiāo）
Work on one’s own
例：由于他的同伴病了，这一摊活儿都靠他单挑。
Since his partner is ill, he is doing all the work on his own.
29.淡出 (dàn chū)
Leave (job) without notice; disappear gradually
例：自从他淡出歌坛后，人们很少能见到他了。
Since he left the singing circle, people have rarely seen her. It’s said she’s emigrated to Canada.
30.点儿背(diǎnr bèi)
Bad luck .
例：我最近点儿很背。
I’m having bad luck this month.
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