必经之路

Explanation: After: After. Must go through the road. Also as "the only way." 　　Source: Lao She, "unnamed hill with name" Nineteen on the 25th is the only way the enemy counterattack, where the high, where the narrow, we are not easy to Yang Gong, can not be multi-purpose human. We need at the appropriate time, give it, and stick to the main peak, and the 27th. " Thesaurus:  the one and only way; the only proper course to take, inevitable course, Zhongnanzhen beeline, facility Door Antonym Group:  at bay, Road to make way poor