Definition: firm and difficult to move Level: B2
确保结打紧。
Make sure the knot is ___tight.
我紧紧抓住他的手臂。
I kept a ___tight grip on his arm.
你应该总是系紧安全带，因为它可能救你的命。
You should always wear a ___tight seatbelt because it could save your life.
