a. 浮动的
v be in motion due to some air or water current
v be afloat either on or below a liquid surface and not sink to the bottom
v set afloat
v circulate or discuss tentatively; test the waters with
v move lightly, as if suspended
v put into the water
v make the surface of level or smooth
v allow (currencies) to fluctuate
v convert from a fixed point notation to a floating point notation
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