Cyclists have their sock length measured
工作人員會在自行車選手上場前測量他們襪子的長度

The sight of officials measuring the hosiery of cycling competitors is one of the event's odder spectacles.
工作人員在賽場上測量騎行選手襪子長度？這堪稱奧運最詭異的奇觀之一。

But under rules introduced in 2012 by Union Cycliste Internationale, the governing body of sports cycling, socks "must not exceed the mid-distance between the ankle and the knee".
但依據國際自行車聯盟（UCI）在2012年出臺的新規定，自行車體育主管團體決定，襪子的長度“不可超過腳踝和膝蓋間距離的1/2”。

This is intended to prevent the use of compression socks, which it's thought can aid recovery and boost performance.
這是為了防止運動員穿彈力襪。這種襪子被認為可以幫助運動員恢復體能，進而取得優異的成績。