Margaret resides with her invalid mother in a London suburb.玛格丽特同她病弱的母亲住在伦敦郊区。At best Nella would be an invalid; at worst she would die.内拉往好里说会落下残疾，往坏处说可能会生命不保。A passport that is out of date is invalid.护照过期是无效的....
C502: 适用于高温蒸煮的各类香肠或火腿制品.C 502 : For high temperature and boil sausages and ham.营养的炒鸡蛋、滑的车达奶酪,配以两片轻脆培根或火腿,是蓬松羊角包的完美搭档.Two Cheddar cheese and two slices of crispy bacon on a large fluffy croissant.早餐则是美式的, 煎饼或熏猪肉或火腿加鸡蛋, 坐在...
Deamination of threonine by the enzyme threonine deaminase produces α - ketobutyrate.苏氨酸被苏氨酸脱氨酶脱氨产生α - 酮丁酸.Objective To study the continuous monitoring method of adenosine deaminase ( ADA ) and its clinical application.目...