大多数情况下，一个条件块依靠一个引用的值发出用户输入动作。

In most cases, a conditional block issues user input actions depending on the value of a reference.

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它帮助风筝减缓前进的势头并为下一个输入动作做好准备。

It helps to slow the kite's forward momentum and prepares it for the next input.

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第二个输入动作是一个更加坚定果断的对上翼的拉，在这个例子中是用左手。

The second input is a firmer pull on the upper wing, in this case with the left hand.

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