他正在拉紧口罩的带子。

He is tightening the ___straps of the mask.

婴儿车上的带子需要系紧以确保安全。

The ___straps on the stroller need to be fastened securely for safety.

她的背包有两条可调节的肩带。

Her backpack has two adjustable ___straps.

她用小皮带把帐篷固定在了背包上。

She ___strapped the tent to her backpack with small belts.