jeer at 嘲笑
tortoise 乌龟
go off 离开
usual steady pace 平时的稳定的步伐
over-take 超过,赶上
plod on 沉重地向前
geese 鹅(复数
crane 鹤
come suddenly down upon 突然袭击
weighted down 过重而坠
have least to fetter 最少牵挂
make no doubt of it 毫不怀疑
make mince-meat of me 拿我当肉吃
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