Mainly analyzes measurement principles of tube-flowing, ball-dropping, plate-rotating, and also introduces measurement methods and application situations.

主要分析了管流法、落球法、圆盘法的测量原理，并对各种测量方法及应用范围予以介绍。

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If you have watched a Man United match recently, you will have noticed Rooney dropping deep around the midfield in search of the ball.

看看最近曼联的比赛吧，你会发现鲁尼回撤很深，常常到中场附近要球。

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Ross and Joey throw a ball back and forth without dropping it for a couple hours; soon it becomes a contest, joined by Monica and Chandler.

罗斯和乔伊来回掷球，数小时未落地。 后来莫妮卡和钱德也加入。

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The Blue Jays led early for the second straight night and outhit New York 10-6 but failed to execute on both sides of the ball in dropping their third of four games on their seven-game road trip.

WSJ: Sloppy Blue Jays fall again to Yankees

Lawmaker Joyce Murray has accused Canada's federal government of "dropping the ball" by not providing enough resources to deliver H1N1 vaccinations -- a charge the government disputes.

CNN: Canada's Olympic-sized plan to fight H1N1

Sure, my personality was a little hampered by shyness and I did a few dumb things like dropping a ball on her daughter's head and tripping over a Hula-Hoop.

CNN: A kind of courtship: Finding a mom friend in the big city