[问答题]
A bucket of water can be wh ejbx3qnw)p0e+e7x*h irled in a verdoi dkvw+;vu5nasd- -/7gen) vnq 4,q y:f1 ddtical circle without the water spilling out, even at 7vq vd/- g k;fa)dndin + o-4:vdu5ewnsdyq,1the top of the circle when the bucket is upside down. Explain.
