(tōng, ㄊㄨㄥ) to go through; to know well; to connect; to communicate; open [CE-DICT]
过
(guò, ㄍㄨㄛˋ) (experienced action marker); to cross; to go over; to pass (time); to celebrate (a holiday); to live; to get along; excessively; too-; surname Guo [CE-DICT]
以
(yǐ, ㄧˇ) to use; according to; so as to; in order to; by; with; because; abbr. for Israel [CE-DICT]
及
(jí, ㄐㄧˊ) and; to reach; up to; in time for [CE-DICT]