自行車法規詢問-cpsc 1512.18(m)

各位自行車業的前輩好，目前小弟在工作上面臨到法規的翻譯以及理解，其中一個法規困擾我多時，是否有哪一位前輩可以幫忙解惑，謝謝
法規內容其中片段：
Procedure. A force of 89 N (20 lbf) shall be applied to the reflector mount in at least three directions selected as most likely to affect its alignment.
｛At least one of those directions shall be selected to represent a force that would be expected in lifting the bicycle by grasping the reflector.｝

這一段我實在完全無法翻譯得很明白讓我自己跟別人都理解，請前輩們幫幫忙，尤其是｛｝內的，謝謝