The engine evaluates each rule from right to left, starting from the rightmost selector (called the "key") and moving through each selector until it finds a match or discards the rule.
该引擎由右至左评估每个规则，从最右边的选择器开始(称为“键”【Key】)，并通过移动每个选择器，直到找到一个匹配或丢弃的规则。
Some CNG vehicles have duel fuel tanks - one for gasoline, the other for CNG - the same engine can operate on either fuel via a selector switch.
而许多CNG汽车在配备天然气燃料的同时两者兼有一个汽油燃料箱，其引擎可以燃烧两种燃料中任意一种。
Some CNG vehicles have duel fuel tanks - one for gasoline, the other for CNG - the same engine can operate on either fuel via a selector switch.
而许多CNG汽车在配备天然气燃料的同时两者兼有一个汽油燃料箱，其引擎可以燃烧两种燃料中任意一种。
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