We had to work quickly and secretively to map the masked tiles before anyone found out what we were doing and removed them because our investigation relied on access to that information.

我们必须在任何人发现我们在做什么并移除它们之前快速而秘密地绘制蒙面瓷砖的地图，因为我们的调查依赖于对这些信息的访问。