＜正＞There was once a bridge which spanned a large river.During most of the day the bridge sat with its length running up and down the river paralleled with the banks,allowing ships to pass through freely on both sides of the bridge.But at certain times each day,a train would come along and the bridge would be turned sideways across the river,allowing the train to cross it.A switch-
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机译：Management of exotic cats: Perspectives of British Wild Animal Keepers A review of Management Guidelines for Exotic Cats, edited by John Partridge. Bristol: The Association of British Wild Animal Keepers, 1991, 153 pp; paperback (price not given)
