(zài, ㄗㄞˋ) (located) at; (to be) in; to exist; in the middle of doing sth; (indicating an action in progress) [CE-DICT]
当
(とう) (pref) this (business organisation or place) [EDICT]
(dāng, ㄉㄤ) to be; to act as; manage; withstand; when; during; ought; should; match equally; equal; same; obstruct; just at (a time or place); on the spot; right; just at [CE-DICT]
(dàng, ㄉㄤˋ) at or in the very same...; to pawn; suitable; adequate; fitting; proper; replace; represent [CE-DICT]