The rings have joints (they are split) so that they can be expanded and slipped over the piston head and into the recessed grooves cut in the piston.是什么意思_The rings have joints (they are split) so that they can be expanded and slipped over the piston head and into the recessed grooves cut in the piston.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句