Core: Pull navel toward spine. Feel curve in lower back flatten slightly.

核心：拉肚脐向脊柱，感觉曲线在下背部稍平。

youdao

The learning curve for minimally invasive spine surgery is a concern, as the patients who had been treated during the initial phases of some studies had higher complication rates53,55.

微创脊柱外科的学习曲线是一个问题，在一些研究的初期阶段，经过治疗的患者存在较高的并发症发生率53，55。

youdao

When you are sitting or driving for long periods of time, place a cushion or rolled-up towel between the curve of your lower spine and the back of your seat.

当你需要坐很久或者开车很久时，应该用垫子或卷起的毛巾垫在脊柱尾部曲线和座椅靠背的空隙之间。

youdao

Her spine begins to curve due to the weight of the baby and her colon moves up into her rib cage.

BBC: The miracle of being

He slept on a mattress with a plywood board underneath it so his spine wouldn't curve.

CNN: Why polio hasn't gone away yet