Use a second blanket to form a thin pillow and lie back so the thin bolster supports your spine from just above your sacrum to the top of your head.是什么意思_Use a second blanket to form a thin pillow and lie back so the thin bolster supports your spine from just above your sacrum to the top of your head.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句