Definition
it would be a wiser or more sensible course of action for someone to do something
（某人）做某事會更明智
You would do better to bring the potted plants inside when the weather turns cold.
當天氣轉冷時，你最好將盆栽植物搬進室內。
They would do better to invest in a new system rather than spend so much money on maintaining the old one.
與其花這麼多錢維護舊系統，他們最好投資一個新系統。
He would do better to heed the advice of a former prime minister.
他最好聽從前首相的建議。