通行 (tōngxíng) vs 通过 (tōngguò): use 通行 when referring specifically to the act of passing through a space or route, while 通过 emphasizes the completion of a process or passage.

Think of 通 (tōng) as 'through' and 行 (xíng) as 'to walk' or 'to move.' Imagine walking through a doorway that is open, representing the concept of passage and the ease of movement that通行 signifies.

通行 is generally used in both formal and informal contexts but is more common in formal settings when referring to permissions or regulations. Be careful not to confuse it with 行通 (xíngtōng), which has a different meaning related to traffic flow. Ensure correct tone to avoid misunderstandings.

While 通行 is not included in HSK lists, it connects with basic verbs like 行 (xíng, to go) and 通 (tōng, to connect). Focus on using it in sentences related to travel or permissions to reinforce its meaning.

In Chinese cities,通行 is often seen in traffic signs indicating passageways or regulations for vehicles and pedestrians, reflecting the importance of organized movement in urban planning.

Learners often confuse 通行 with 行通, which implies 'traffic flow' rather than 'to go through.' Make sure to use 通行 when discussing permissions or passages, as in '我有通行证' (I have a pass).