20 17-05-25 Thursday
30℃/ 14℃ sunny south wind 3-4.
20 17-05-26 Friday
31℃16℃ sunny south wind 1-2.
Saturday 20 17-05-27
34℃/2 1℃ sunny southwest wind 1-2.
1, the broad concept of "constant" is:' invariant quantity' (for example, the quantity that will not be modified by the program when the computer program is running