回波

echo (e.g. radar) / returning wave

to circle / to go back / to turn around / to answer / to return / to revolve / Hui ethnic group (Chinese Muslims) / time / classifier for acts of a play / section or chapter (of a classic book)

to curve / to return / to revolve

variant of 迴|回[hui2]

Poland / Polish / abbr. for 波蘭|波兰[Bo1 lan2]

wave / ripple / storm / surge

gradient echo