短語(yǔ)詞組短語(yǔ)back to arch 背反弓back of arch 拱背tip back bend arch 末端后傾彎back arch on leg 站在腿上體后屈Back Arch Tone 背拱音turtle back arch 圓穹頂no back arch concurrent 無(wú)后拱順流energy -saving back arch 節(jié)能后拱arch back 體后屈;有弧度的底部 返回 back arch