had better是固定词组，相当于一个情态动词，用来表示一种建议和劝告，意思是“最好……”、“还是……好”。
例句
You had better go to Singapore.
你最好去新加坡。
We had better take off our coats.
咱们最好把外套脱掉。
He had better go to bed.
他最好去睡觉。
I had better take it off and eat it.
我最好把它拿下来吃了。
You had better drive slowly and carefully.
你最好开慢点，小心点。
光学科技期刊
