问题之一是对机场员工的安检措施马虎松懈。One of the problem areas is lax security for airport personnel.松懈的保安措施使小偷有机可乘.Lax security allowed the thieves to enter.你不要松懈.You must not relax in your efforts....
Leukemias typically fill up the marrow with abnormal cells, displacing normal hematopoiesis.典型的白血病有很多不正常的细胞充满骨髓, 取代正常的造血功能.It replaces the polluted air by successively displacing it by fresh air.它用新风成功有效地替换了污浊的空气.Women p...