Among the 1001 natural numbers 1000, 1001, ..., 2000, how many pairs of adjacent natural numbers can be found that satisfy the requirement that they do not carry when added?
在1000，1001，…，2000这1001个自然数中，可以找到多少对相邻的自然数，满足它们相加时不进位？
<result>155</result>