Positive ions drift downward, negative ions drift upward.

正离子向下漂移，负离子向上漂移。

youdao

Much change is due to random genetic drift rather than positive selection. It could be called the survival of the luckiest.

许多变化源于基因的随机变异而非自由选择。我们可以称其为幸运者生存。

youdao

Much change is due to random genetic drift rather than positive selection. It could be called the survival of the luckiest.

许多变化源于基因的随机变异而非自由选择。我们可以称其为幸运者生存。

youdao