| 单词 | 它们发出声波 |
| 例句 | DEFINITIVE EXAMPLES 权威例句〔send out〕Like bats, they send out sound waves and make sense of their environment from the echoes they receive back.像蝙蝠一样，它们发出声波，然后根据收到的回音来了解周围的环境。柯林斯高阶 |
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