王牌二手车货车4米2长:急需英翻中6

As has been reported for freely
feeding rats (Richter, 1927), in our paradigm
daily food intake is divided into multiple
meals that vary in size and intermeal interval,
and foraging is primarily nocturnal, with
about 70% of intake occurring in the dark.
In addition to the feeding economy, the
current experiment differs from many others
in these additional respects: Each search was
initiated by the animal and search cost was
constant, the patches contained the same
food and were encountered either equally often
(some conditions) or unequally often
(other conditions), and the animal controlled
the frequency of foraging and the size
of meals. Only the costs of access to the two
patches varied. The animal’s decision was
whether to pay the price to procure access to
a patch it had encountered or to search further.
These conditions satisfy the assumptions
of the patch-choice model (Schoener, 1987).