Knee pads While shin pads are okay to be worn on the field of play, knee pads are prohibited.

护膝虽然在比赛场上可以戴护腿，但护膝是被禁止的。

But it begins with a haunting image in silhouette, the kids' bikes chained up in a row at the cave entrance, football boots, shin pads left behind with no sign of their owners.

最初的线索是一个侧影的形象。孩子们的自行车排成一排停在洞口前，被链子拴在一起，周围是他们的足球鞋、护膝，但没有孩子们的踪影。