先的英語翻譯：

ancestor; before; deceased; earlier; in advance
【醫(yī)】 fore-

科的英語翻譯：

a branch of academic study; family; pass a sentence; section
【化】 family
【醫(yī)】 department; family; family systematic
【經(jīng)】 accountant's department; division head; section

酯的英語翻譯：

ester
【化】 ester
【醫(yī)】 compound ether; ester; lactam; lactan

制備的英語翻譯：

preparation
【醫(yī)】 preparation
【經(jīng)】 preparation