An event object is like a switch: it has only two states: on or off.
一个事件对象如同一个开关：它仅有两种状态：开和关。
Alligators are found only in two countries: the United States and China.
短吻鳄只存在于两个国家：美国和中国。
Only when the two states are both balanced can the body be truly healthy.
如果人们能够达到心理平衡，就是把握了自体健康的金钥匙。
Only when the two states are both balanced can the body be truly healthy.
如果人们能够达到心理平衡，就是把握了自体健康的金钥匙。
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