the concept of time as a continuous flow of events from the past through the present to the future; often contrasted with 空间 kōng​jiān

Negative adverb used before verbs, adjectives, and other adverbs to indicate negation; also used as a bound-form prefix to form terms with opposite meanings

early in a period of time; at an initial stage; earlier than a scheduled or expected time

Placed at the end of a sentence to indicate a new situation, a change in circumstances, or to convey imperative or exclamatory force.