the danger is that niose-induced hearing loss sustained over time will
be permanent with no good chance of recovery.
the danger 是主詞
is 是動詞
that 後面接的是名詞子句 可是裡面有sustain 還有 be 動詞，我看不懂為什麼有
兩個動詞？？
謝謝各位大大喔
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