by spells的用法和樣例：
例句
用作副詞 (adv.)
- I have been working at the book by fits and starts during the past five or six years.
近五六年來我一直斷斷續續地寫這本書。 - That night I had been tired, so Ed moved me out of our bed, spread towels over the pillows and put a plastic bowl by Hannah's head.
那天晚上，我累了，埃德來替換我，他在枕頭上鋪好毛巾，在漢娜的頭旁放一個塑料碗，一切都做完后才躺下來，斷斷續續地睡了一夜。
