(you can advance these simulations using the step and play buttons)
物资匮乏的年月，人们总有法子给自己寻开心。抡火球就在我家乡那一带盛行。年轻人相约着抡火球，把火球抡得璀璨亮眼，不只是显手上功夫，也是对未来生活的祝愿和祈盼。新的一年像火球一样红红火火，是多少人的盼望啊！火球不单大人们抡，小孩子也抡。大人有法子找到好的道具，有生产队的仓库做后盾，那里简直就是百宝箱。小孩子就惨了，为了得到一个炊帚疙瘩要煞费苦心，使出浑身解数。，推荐阅读新收录的资料获取更多信息
，推荐阅读新收录的资料获取更多信息
By rolling back a bedrock climate legal determination, the Trump administration has undercut its attacks on a groundbreaking state climate accountability law, green groups have argued in court.，更多细节参见新收录的资料
"It's a period where the history is not yet written," says Dr Seaman.
When a bounded buffer fills up and a producer wants to write more, there are only a few things you can do: