The paper begins with the introduction of traditional methods to measure the trapezoid angle and the ring height, analyzes their characters and limits.
论文首先讲述了我国目前大部分工厂活塞环检测仪器的现状及传统的梯形角与环高的测量方法，分析了它们的特点和局限性。
His explosive power and jumping ability are amazing. Everytime he dunks, his eyes have already reached the height of the ring.
他的爆发力和弹跳力让人惊艳，每当他扣篮的时候，他的眼睛就已经达到了篮圈的高度。
His explosive power and jumping ability are amazing. Every time he dunks, his eyes have already reached the height of the ring.
他的爆发力和弹跳力让人惊艳，每当他扣篮的时候，他的眼睛就已经达到了篮圈的高度。
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