| 单词 | retractile |
| 例句 | DEFINITIVE EXAMPLES 权威例句〔snail〕Any of numerous aquatic or terrestrial mollusks of the class Gastropoda, typically having a spirally coiled shell, broad retractile foot, and distinct head.蜗牛：腹足科众多水生或陆栖软体动物中的一种，通常带有一螺旋似的厚壳，足宽且向内旋，脑袋清晰美国传统 |
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