Maintain the natural curve in your lower back, and keep your core muscles tight.
保持腰背部的自然弯曲，保持收紧你的核心肌肉。
Support the curve in your lower back.
后背的下半部分应有一定得曲线。
Maintain the natural curve in your lower back, and don't hold your breath.
保持腰背部的自然弯曲，不要屏住呼吸。
Maintain the natural curve in your lower back.
保持腰背部的自然弯曲。
The lumbar support roll should fit into the curve in your lower back.
腰支持辊应与您下背部曲线相配合。
You need to maintain your normal spinal curve to keep your back safe.
你要保持常态的曲线以保证背部的安全。
The gentle curve from the back along the arm is very appealing.
壁背柔和的曲线非常迷人。
The gentle curve from the back along the arm is very appealing.
壁背柔和的曲线非常迷人。
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