As part of his outreach work, Yu learned that a man sleeping in a park on the Upper East Side of Manhattan - "Bill" -was depressed.
作为Yu外展工作的一部分，他了解到睡在曼哈顿右上部某公园里的一个人情绪低落——他叫Bill。
The machine will link the upper and lower to the upper bearing the weight and work load, and the upper to the lower part of the rotation.
它将机器的上部和下部连接起来，用以支承上部的重量和工作负荷，并使上部能相对于下部旋转。
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