适应性变异最初表现为小群人发病，一些证据显示人际传播，这或许可给世界一些时间采取防御行动。

Adaptive mutation, expressed initially as small clusters of human cases with some evidence of human-to-human transmission, would probably give the world some time to take defensive action.

youdao

适应性变异最初表现为小群人发病，一些证据显示人际传播，这或许可给世界一些时间采取防御行动。

Adaptive mutation, expressed initially as small clusters of human cases with some evidence of human-to-human transmission, would probably give the world some time to take defensive action.

youdao