My wife told me a joke at dinner.

The wife of this sentence means to ask her husband to do two things, 1, buy a catty of steamed buns to bring back after work, and 2, if you see a watermelon seller, buy a watermelon. . This means that my husband will bring back a catty of steamed stuffed bun and a watermelon when he comes back. . .

The programmer's husband understands that if, otherwise. To put it simply, the husband understands that his wife only asks him to do one thing, that is, buy steamed buns. . I didn't see the watermelon seller, so I bought a catty of steamed buns and brought them back. If you see a watermelon seller, buy a steamed stuffed bun. .