It is crucial that the upper back and neck are held in an erect position to give support for the head.
重要的是：上背和颈部要挺直以支撑头部，这一点很重要。
To check this, turn off your device, then turn it back on with the 'back' key held.
要检查这，请关闭您的设备，然后打开它的'回'的关键举行。
They held back and it did hurt them.
他们举行了回来，它伤害了他们。
I'm really happy now that everything is back to how it should be and that my knee held out.
我真的很高兴现在所有事都步入了正轨，而我的膝盖也好的差不多了。
I'm really happy now that everything is back to how it should be and that my knee held out.
我真的很高兴现在所有事都步入了正轨，而我的膝盖也好的差不多了。
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