然而令人们感到疑惑的是，最近结束的上一个太阳周期，太阳活动低潮期相对特别长，太阳活动极其微弱。

Puzzlingly, the last solar cycle, which ended recently, had an especially long and weak low point that scientists had difficulty explaining.

youdao

然而令人们感到疑惑的是，最近结束的上一个太阳周期，太阳活动低潮期相对特别长，太阳活动极其微弱。

Puzzlingly, the last solar cycle, which ended recently, had an especially long and weak low point that scientists had difficulty explaining.

youdao