| 摘要 |
A measuring portion ( 40 ) is attached to a flexible portion ( 10 ) allowing the measuring portion ( 40 ) to slide along the length of the flexible portion ( 10 ). The flexible portion comprises an expandable end ( 30 ) and a valvable end ( 50 ). The required lengths are determined from graduated markings of distance ( 20 ) along the length of the flexible portion ( 10 ).
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