| 单词 | arthropod family |
| 例句 | Rather than occurring at the base of the true arthropod family tree, the new discovery suggests that these creatures with two-part shells actually appeared later in the family tree and are in fact early mandibulates. Pincer-wielding 507m-year-old fossil sheds light on evolution of crabs 2017-04-26T04:00:00Z |
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