背要直，只弯两膝。
双膝弯曲，两脚着地，躺在这个滚筒上，让它沿着你的脊柱，一直从尾骨到头顶。
Lie on the roller with your knees bent and your feet on the floor, so the roller extends along your spine from your sitting bones to the top of your head.
因为双膝一直僵直，那么整个重量势必都将由下背部的肌肉负担。
Because both knees are always tetanic, lower back's muscle will burden all weight.
魔力小布的秀发直垂到膝，他的直刘海也让她看起来年轻可爱。
Mod Molly straight hair comes down to her knees and her pin straight bangs make her look young and girly.
叛徒吓得两膝直打战。
过去15年，严重的膝腿问题一直困扰着我。
For the past 15 years I have been bogged with severe knee and leg issues.
等到双膝已经无法弯曲时，已是在下山的路上，恋人们互相鼓励，紧握在一起的手一直未曾松开…
Wait until the knees can not bend when it is already in the way down the mountain, lover encouraging each other, grasping hands together has not been released…
等到双膝已经无法弯曲时，已是在下山的路上，恋人们互相鼓励，紧握在一起的手一直未曾松开…
Wait until the knees can not bend when it is already in the way down the mountain, lover encouraging each other, grasping hands together has not been released…
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