■ bow and arrow

“弓箭”如果理解为一种武器的整体，作为主语时动词用单数。

• The bow and arrow was invented at that time.弓箭是那个时候发明的。

• person
• persona
• personage
• personality
• person, persona, personage 与 personality
• persuade
• ph. d
• phd
• ph. d., phd
• photo op
• physical
• pigeon
• pile
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• pm
• point
• policy
• political
• political, politics
• politician
• politician, politico 与 statesman
• politico