backing strap

例句：

1. 1. The baby is wearing a backing strap to keep him from falling asleep.
   婴儿戴着背带以防他睡着。
2. 2.The backpack has a backing strap that attaches to the shoulder strap.
   背包有一个背带式支撑物，可以连接到肩带上。
3. 3. The car's backing strap was too tight, causing her to feel uncomfortable.
   汽车的背带太紧了，让她感到不舒服。