I doubt it, sir. We'll try, but I can't promise anybody before 3:30.
我没把握,先生。我们会尽早的,但我不敢许诺3:30以前行。
Those planning a trip to remote areas, or intending to live in countries where drinking water is not readily available, should know about the various possible methods for making water safe.
那些计划去偏远地区旅行,或在饮用水不现成的国家居住的人,应该知道如何使水适于饮用的各种办法。