The discovery of the cowpox vaccination let the danger of vaccination more less, and cost lest.牛痘术的发明使种痘的危险性更小, 花费也降到最低,故而很快在全世界推广开来.In nineteen century, Enligh doctor Pearson came to Macao to spread the cowpox vaccinati...
Lizzie bought herself a mountain bike.莉齐给自己买了辆山地自行车。Lizzie used to play the violin.莉齐曾拉过小提琴。He counted on Lizzie for her sense of humor , her sense of the outrageous.他欣赏利齐的幽默感和泼辣劲....
North America is connected with South America by the Isthmus of Panama.巴拿马海峡把北美同南美连接起来.The north and south of the island are linked by a narrow isthmus.岛的北部和南部由一条狭窄的地峡相连.It was the neck of land which we call the Isthmus ...