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发帖数: 800 | 1 ☆─────────────────────────────────────☆
maglion (da木头) 于 (Mon Jan 22 12:21:47 2007) 提到:
A traveler starts from somewhere on the earth surface. She walks 1 mile east
, then 1 mile south, then 1 mile west, then 1 mile north. To her surprise,
she finds herself not EXACTLY at where she starts (she is so picky that any
deviance larger than 10^-30 cm is intorlerable). Is that really a surprise,
for this picky lady? Where can she starts instead to be albe to return to
exactly the same place?
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