在公共场所所有的狗必须用皮带牵住。

All dogs must be kept on a leash in public places.

因为婴儿摔倒时都是头先朝下的，测试人员就牵住孩子所穿背心上的带子，以防摄像头伤了他们，而在其他方面孩子都是可以自由活动的。

Since infants often fall headfirst, spotters hold straps attached to vests the children wear to prevent them from injuring themselves with the cameras, but the children are otherwise free to move.