The boundary between the two, the tropopause, is about 18km above your head, if you are in the tropics, and a few kilometres lower if you are at higher latitudes (or up a mountain).
如果你身处热带，这两大气层的分界线——对流层顶离你的头顶约18公里高；如果在高纬度地区(或高山上)则少几公里。
Start with the toes and visualize relaxing them and let them relax; do the same for your feet, ankles, lower legs, legs, stomach, torso, fingers, hands, arms, neck, then head.
从脚趾开始，想象一下让他们放松并让他们真正的放松，然后是叫，脚踝，小腿，大腿，腹部，躯干，手指，手臂，脖子，然后是头部。
Now lower back down slowly and controlled while inhaling through your nose, just until your shoulder blades touch the ground. Do not let your head touch the ground and repeat.
现在用鼻子吸气，慢慢躺下，但不要让头部接触地面。
People with lower confidence often tend to have poor posture. Stand up, sit up, and keep your head up. It's an instant confidence booster.
不自信的人往往姿态也不好。站有站相，坐有坐相，时辰保持昂首挺胸的姿态。这会让你的自决心瞬间膨胀。
This creates a trough either side of your head and body that is beneath the surface level of the pool - so there's air lower than you might expect there to be.
这将在你的身体和头部两侧制造一个凹槽，它位于游池水面的下方-因此在你比你期望更低的位置有空气存在。
If your horse raises his head out of your reach, you will need to teach him to lower his head.
如果你的马把头抬高到你够不到的地方，你就需要教会他低下他的头。
If your horse raises his head out of reach, you'll have to teach him to lower it.
当你的马已经在有笼头情况下学会低头，在没有有笼头的情况下重复这个过程。
If your horse raises his head out of reach, you'll have to teach him to lower it.
当你的马已经在有笼头情况下学会低头，在没有有笼头的情况下重复这个过程。
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