Piga
abbr. polymeric immunoglobulin A 多聚免疫球蛋白A
??? 情景例句
There's a long way to go in reviving the countr's economy.
這個國家的經濟復蘇還有很長一段路要走。
Be considerate toward the poor.
應常為窮人著想。
I told her what the revolutionaries were doing and I persuaded her to help me.
我告訴她革命者都在干些什么事，并說服她給我幫忙。