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流す， ながす
1. to drain, to pour, to run, to let flow, to flush, to shed (blood, tears), to spill
2. to float (e.g. logs down a river), to set adrift
3. to wash away, to carry away, to sweep away
4. to broadcast, to play (e.g. music over a loudspeaker), to send ...
排出、倾倒、流淌、让……流下、冲洗、流出(血液、泪水)、溢出；冲走；使……漂浮，使……随波逐流；进行广播、播放(例如通过扬声器播放音乐)、发送(通过电线传输电能)
に
1. at (place, time), in, on, during
2. to (direction, state), toward, into
3. for (purpose)
4. because of (reason), for, with
5. by, from
6. as (i.e. in the role of)
7. per, in, for, a (e.g. "once a month")
8. and, in addition to
9. if, although
tbd