除非计划奏效，否则该总统会面临一个难关。
The president could face a rough ride unless the plan works.
否则，该属性会影响所有随后的方法声明，因为标记仍然为真。
Otherwise, this attribute will affect all subsequent method declarations because the flag would remain true.
否则，该街区的持枪歹徒就不允许救护车通过。
Otherwise, the district's gunmen will not let the ambulance through.
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