名詞 by and by:

1. an indefinite time in the future
   同義詞：by-and-by

副詞 by and by:

1. at some eventual time in the future
   同義詞：later

1. It's very likely to clear up by and by.
   很可能不久要放晴了。
2. By and by the clouds disappeared.
   烏云不久便消散了。
3. They'll be arriving by and by.
   他們不久就要到達。
4. We'll meet again by and by.
   我們不久又會再見。