Then they were on sand, feet grating in it.

然后他们在沙滩上，脚踩在沙子上发出刺耳的声音。

They circled each other, bare feet grating on the floor, watching with eyes intent for the slightest opening.

他们互相围成一圈，赤脚在地板上摩擦，眼睛盯着最细微的开口。