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1.in danger of 有危险
例句：Britain's university system is in danger of falling apart at the seams.
英国的大学体系面临分崩离析的危险。
2.die out 灭绝
例句：How did the dinosaurs die out?
恐龙是如何灭绝的？
3.ethnic identity 种族认同
例句：It also teaches the young about their ethnic identity.
它也教导年轻人对他们的种族身份。
4.best-known 著名的
例句：Van Gogh is probably the best-known painter in the world.
凡·高可能是世界上最知名的画家。
