apparatus
n.
1620s, from Latin apparatus "tools, implements, equipment; preparation, a preparing," noun of state from past participle stem of apparare "prepare," from ad- "to" (see ad-) + parare "make ready" (see pare).
〔李〕[ap-(ad-);-par;-atusn.] n.器械，设备； 器官； 机构 ←par (L parare)=to prepare 准备