Numerous ideas were submitted for the project, including concepts ranging from rolling eggs to tilting tanks, from giant seesaws to overhead monorails.
许多人为该项目提供了想法，包括从滚动的鸡蛋到倾斜的坦克，从巨大的跷跷板到空中单轨铁路等概念。
their seesaws always went up,but they never came down.
他们的跷跷板总是起来，但是从不下去。
Their seesaws always went up, but they never came down.
跷跷板一头压下去就再也起不来了。
N. An outdoor area set aside for recreation and play, especially one containing equipment such as seesaws and swings.
操场；运动场；游乐场：用于消遣和玩耍的户外场地，尤指提供，如跷跷板和秋千等设备。
N. An outdoor area set aside for recreation and play, especially one containing equipment such as seesaws and swings.
操场；运动场；游乐场：用于消遣和玩耍的户外场地，尤指提供，如跷跷板和秋千等设备。
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