if you put a buzzard in a pen(围栏) six or eight feet square and entirely open at the top, the bird, in spite of his ability to fly, will be an 1 prisoner. the reason is that a buzzard always begins a 2 from the ground with a run of ten or twelve feet. without space to run, as is his 3 , he will not even attempt to fly, but will remain a prisoner for life in a（n） 4 jail with no top.
the ordinary bat that flies around at night, who is a 5 nimble(敏捷的) creature in the air, cannot take off from a level place. if it is placed on the floor or 6 ground, all it can do is shuffle（拖着脚步）about 7 and, no doubt, 8 , until it reaches some slight elevation from which it can 9 itself into the air. then, at once, it takes off like a flash.
a bumblebee if dropped into an open tumbler（平底无脚酒杯） 10 will be there until it dies, unless it is taken out. it never sees the means of 11 at the top, but persists in trying to find some way out through the sides near the 12 . it will seek a way where none exists, until it 13 destroys itself.
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