Ppsa
abbr. Pan-Pacific Surgical Association 泛太平洋外科医生协会; prepaid service agent 预付费业务代理
🗣️ 情景例句
Good morning.
早安。
It's about time to get up.
差不多该起床了。
Alternatively, if the star were small, the life-supporting planet would have to have a close orbit round it and also provide the perfect conditions for life forms to develop.
反之，如果恒星很小，维持生命的行星就要在离恒星很近的轨道上运行，而且要有极好的条件才能使生命得以发展，