若是上色的时候不小心弄坏了那些地图，他们可承担不起。They could not afford to spoil those maps by careless colouring.罗伊小心地把腿挪下沙发，坐了起来。Roy swung his legs carefully off the couch and sat up.他不小心撞到了桌子，把花打翻了。He had blundered into the table, upsetting ...
Looking still further ahead, by the end of the next century world population is expected to be about ten billion.再往前看，到下个世纪末世界人口预计将达约 100 亿。The population began to decrease.人口开始减少。A large percentage of the population is ...