I buckle up all the time for my own safety.为了自身的安全我都会系上安全带.According to the new law, all drivers and passengers must buckle up.根据新的法律, 所有的司机和乘客都必须系牢车上的安全带.Tony can already buckle up his shoes although he is only five.托尼虽...

buckle up的音标：...

系好（安全带）...