day and night line

基本解释

The second line of the verse says that we should wait on our sick parents day and night, without leaving their bedside.
所以這後兩句文字，說不論白天夜晚都侍奉著，不離開父母的牀邊；
The shape of this line between night and day varies with the seasons, which means different lengths of days and differing amounts of warming sunshine.
這條黑夜與白天分界線的形狀隨著季節的變化麪變化，它代表著不同的白天時間長度和不同的陽光照射量。
But after 45 minutes of daylight, a dark line appears on the planet, dividing Earth into night and day.
但在 45 分鍾的日光照射之後，一道黑暗線就出現在地球上了，它將地球分割爲白天和黑夜兩個地區。