她检查了瓶盖的紧度，确保不会漏水。

She checked the ___tightness of the bottle cap to prevent any leaks.

袜子的紧实度让我的脚感到有些不适。

The ___tightness of the socks made my feet feel a bit uncomfortable.

做完瑜伽后，他感到背部有些紧绷感。

After yoga, he felt some ___tightness in his back.

学校对手机使用的严格规定让学生们感到不适。

The ___tightness of the school's rules about phone usage made students uncomfortable.