Walden 精彩片段：
Spring
The opening of large tracts by the ice-cutters commonly causes a
pond to break up earlier; for the water, agitated by the wind, even
in cold weather, wears away the surrounding ice. But such was not
the effect on Walden that year, for she had soon got a thick new
garment to take the place of the old. This pond never breaks up so
soon as the others in this neighborhood, on account both of its
greater depth and its having no stream passing through it to melt or
wear away the ice. I never knew it to open in the course of a
winter, not excepting that of 52-3, which gave the ponds so severe
a trial. It commonly opens about the first of April, a week or ten
days later than Flints Pond and Fair Haven, beginning to melt on
the north side and in the shallower parts where it began to freeze.
It indicates better than any water hereabouts the absolute progress
of the season, being least affected by transient changes of