有步枪射击发出的嘎嘎声。
发动机的嘎嘎声很大。
突然，从外面的院子里传来一阵奇怪的嘎嘎声。
Suddenly from out in the yard came a strange croaking noise.
过了一些时候，我回来了，仍然听见它发出恐惧的嘎嘎声。
After some time, as I was coming back, I could still hear its terrified croaking.
过了一些时候，我回来了，仍然听见它发出恐惧的嘎嘎声。
After some time, as I was coming back, I could still hear its terrified croaking.
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