Lingling and Dongdong are waiting for a bus.The bus is going to take them to the beach."What are we going to do?""We're going to swim."Who are we going to meet Anne,Peter and Mingming.The children sit on the beach.When are we going to swim?We're going to swim soon.We're going to put on our swimming suits first.Dongdong wants his lunch.He is hungry.Can we have lunch first?No,we can't.Don't swim after a meal,Dongdong.It's dangerous.这篇课文是什么意思?谁能帮帮我?急需啊!!