Thirty days has September,
三十天的月份有九月、
April, June and November;
四月、 六月和十一月
February has twenty-eight alone.
二月仅有二十八天。
All the rest have thirty-one.
其余月份有三十一天。
Except in leap year.
除了在闰年。
That's the time.
在闰年，
When February's days are twenty-nine.
二月份有二十九天。