The visa validity is the length of time within which you are permitted to present your visa to a U. S. immigration inspector and request permission to enter at a United States port-of-entry.
签证的有效期是指在这个时间段内，您被允许在美国入境港口向美国移民视察员出示您的签证，并请求进入美国。
The visa validity is the length of time within which you are permitted to present your visa to a U. S. immigration inspector and request permission to enter at a United States port-of-entry.
签证的有效期是指在这个时间段内，您被允许在美国入境港口向美国移民视察员出示您的签证，并请求进入美国。
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