The length, width and height of the airport shall not exceed1m. It can be considered that the maximum length, width and height of the articles to be carried are 1m, just like a cube whose length, width and height are 1m respectively. Because we know that the diagonal length of a cube is the sum of the squares of its length, width and height under the root sign, that is, √( 1? + 1? + 1? ) =√3, which is approximately equal to 1.732 and greater than 1.6, so it is not considered as exceeding the standard.