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1·The sun stops moving south…at least perceivably for 3 days.

太阳停止继续向南移动…至少能感觉到有3天的时间。

2·Here a curious thing occurs: the Sun stops moving south, at least perceivably, for 3 days.

这是一个稀奇的的事情发生了：太阳至少有三天停止了向南的运转。

3·The method is perceivably slower than the time that is required to set or get the value of a field.

与设置或获取字段值所需的时间相比，此方法的速度明显较慢。