一些想法必须通过验证法加以证实。Some thought must be given to the method of validation.他逃到了哥斯达黎加以逃避服兵役。He fled to Costa Rica to avoid military service.但是德国坚持对进口波兰煤炭加以限制.Germany, however, insists on restrictions on the import of Polish c...
Herds of bison live in the park.公园内住有成群的野牛。In the year 1700,about 60 million bison wandered freely in North America.在1700年约有6000万头野牛在北美无拘无束地活动。Large herds of bison used to live on the plains of North America.大群的野牛过去曾生活在北...