临界点

critical point / boundary point

to face / to overlook / to arrive / to be (just) about to / just before

critical / boundary

(bound form) boundary; border / (bound form) realm

point / dot / drop / speck / o'clock / point (in space or time) / to draw a dot / to check on a list / to choose / to order (food in a restaurant) / to touch briefly / to hint / to light / to ignite / to pour a liquid drop by drop / (old) one fifth of a two-hour watch 更[geng1] / dot stroke in Chinese characters / classifier for items