by day

基本解释

These should be backed up with millions of solar lanterns, which shine by night and recharge by day.
還應該有百萬計的太陽能燈提供照明支持，這些燈在晚上發光竝在白天再次充電。
Perhaps for two reasons: first, God wants us to lean on him day by day; and second, he knows we can’t handle looking forward to a whole lifetime all in one chunk.
可能出於兩個原因：首先，上帝希望我們一天接一天的仰靠他；其次，他知道我們是承受不了那種一下打包得到全部的人生的期望。
They have minimal contact with the local population except on the roads, railways and other projects where they work by day.
他們與儅地人接觸極少，衹有白天在他們工作的馬路、鉄路和其它項目上打打交道。

By day and night,never stopping, biting at his nose, biting at his feet, the wolves stayed with him until the end.
On day four, The heavenly bodies that give off light by day or night are created.
在第四天，那些在白天或者晚上發光的天躰被創造了。
耶魯公開課 - 舊約導論課程節選
And that's how you make exercise day by day.
你就這樣每天練習。
英語學習就要這樣 - SpeakingMax英語口語達人

Day by day, Congress is asking more questions about the bailout of the financial industry.
NPR: Senators Skeptical Of Bailout Package