He told me to be watchful on the way and be careful not to catch cold at night.
他嘱我路上小心，夜里要警醒些，不要受凉。
Merely being exposed to a new cold virus, however, is not enough for a person to catch a cold, since a strong immune system can successfully fight off some new viruses.
然而，仅仅是接触到一种新的感冒病毒并不足以导致一个人患感冒，因为强壮的免疫系统能够成功地战胜一些新病毒。
Merely being exposed to a new cold virus, however, is not enough for a person to catch a cold, since the strong immune system can successfully fight off some new virus.
然而，仅仅是接触到一种新的感冒病毒并不足以导致一个人患感冒，因为强壮的免疫系统能够成功战胜一些新病毒。
Merely being exposed to a new cold virus, however, is not enough for a person to catch a cold, since the strong immune system can successfully fight off some new virus.
然而，仅仅是接触到一种新的感冒病毒并不足以导致一个人患感冒，因为强壮的免疫系统能够成功战胜一些新病毒。
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