Until the structure of viroids was determined 25years ago, most believed that protein was also required.

25年前类病毒的结构被确认后，大多数科学家才相信蛋白质也是需要的。

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Until the structure of viroids was determined 25years ago, most believed that protein was also required.

25年前类病毒的结构被确认后，大多数科学家才相信蛋白质也是需要的。

youdao