Translation

• (of trains) up (i.e. towards the capital)
• (of river boats) to go against the current
• to submit (a document) to higher authorities

Synonyms

• 上水, 上溯

Examples

• 时间不多，我们必须马上行动。
  Time is short, we must act NOW.
• 那是人类第一次在月球上行走。
  That was the first time that a man walked on the moon.