Lower heels to the floor, feet pointing straight ahead.
脚跟向下踩向地板，脚趾指向头部的方向。
They dug in their heels and would not lower the price.
他们说什么也不肯降价。
Slowly lower both heels. Hold for 20 seconds, then repeat.
手扶着墙或栏杆，在楼梯台阶上尽力踮脚，脚跟慢慢降低，保持20秒，然后重复动作。
Slowly lower both heels. Hold for 20 seconds, then repeat.
手扶着墙或栏杆，在楼梯台阶上尽力踮脚，脚跟慢慢降低，保持20秒，然后重复动作。
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