重要的是：上背和颈部要挺直以支撑头部，这一点很重要。
It is crucial that the upper back and neck are held in an erect position to give support for the head.
这门课并不要求大家去背元素周期表，一点都不要求。
You will never in this class have to memorize anything about the periodic table.
死记硬背有很多的局限性，这一点我们必须承认。
We should admit that rote learning has a number of limitations. Think about this situation.
明白这一点就不用死记硬背了。
能让你的背舒服点。
能让你的背舒服点。
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