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For example, pink - negative event, yellow - neutral event and green - positive event.
例如，粉红——消极事件，黄——中性事件，绿——积极事件。
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They were red and green, gas-powered, in the event of a leak.
信号灯除红色和绿色，使用煤气，在漏油时会非常危险。
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They were red and green, gas-powered, in the event of a leak.
信号灯除红色和绿色，使用煤气，在漏油时会非常危险。
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