In photography, the essential light sensitive coating on ph otographic film comprising gelatine and silver salts.在照相技术中, 覆盖在照相底片上的由胶和银盐组成的感光物质.Use a little milk to soak the gelatine powder first.吉利丁先用少许牛奶浸泡开....powdered ...
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....