Prototheria

常见例句

• the most primitive mammals comprising the only extant members of the subclass Prototheria.
  最原始的哺乳動物，組成原獸亞綱唯一的現存種類。
• the most primitive mammals comprising the only extant members of the subclass Prototheria
  最原始的哺乳動物，組成原獸亞綱唯一的現存種類
• primary mammal (Prototheria)
  原獸亞綱
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