Constant vigilance is necessary in order to avoid accidents.
为了避免意外事故，必须经常保持警惕。
She stressed the need for constant vigilance.
她强调必须时常保持警惕。
Constant vigilance is needed to combat this evil.
同这种邪恶作斗争需要时刻保持警惕。
Virus protection requires constant vigilance.
病毒防护需要不断的警惕。
Virus protection requires constant vigilance.
病毒防护需要不断的警惕。
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