We promise to deliver within 48 hours.
我们承诺在48小时内送到。
Within 48 hours, they had begun their long journey.
在48小时内，他们就开始了漫长的旅程。
You should contact China East reservation office within 48 hours before your departure.
出境前48小时以内，你必须跟东航订位组联络。
You should contact China East reservation office within 48 hours before your departure.
出境前48小时以内，你必须跟东航订位组联络。
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