Therefore, we must be vigilant!
所以大家一定要警惕！
For this reason, he adds, we must be vigilant.
他还说，我们必须对此保持警惕。
If this is true, we must certainly be vigilant.
这如果是事实，就很值得我们警惕！
And while such things can never be forgotten, we must remain vigilant in our cause!
不过虽然我们绝对不能忘记这件事，但我们必须更加的保持着警戒之心！
And while such things can never be forgotten, we must remain vigilant in our cause!
不过虽然我们绝对不能忘记这件事，但我们必须更加的保持着警戒之心！
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