如果不及时治疗，蛀牙会越来越深。
If left untreated, decay goes deeper and deeper into the tooth.
如果你不及时作出决定，就会两头落空。
If you don't make your choice in time, you are likely to fall between two stools.
如果不及时治疗或确诊的话，结核病对于HIV阳性的人有可能是致命的。
Also, TB in HIV-positive people is more likely to be fatal if undiagnosed or left untreated.
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