song song means "parallel" (adjective). parallel (not intersecting); simultaneous (happening at the same time).
How is song song pronounced?
You can listen to song song on this page in both Northern and Southern Vietnamese accents.
How is song song used in a sentence?
For example: Hai đường thẳng này song song với nhau. (These two lines are parallel.); Chúng tôi làm hai việc song song. (We are doing two things at the same time.).
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