I can assure you that as long as you stay at home, you're safe.
我可向你保证,只要你呆在家里就会很安全。
Politeness is to do and say the kindest thing in the kindest way.
文雅就是善良地做事,和善地说话。
Some of the bigger firms are engaged in researches which are of such general and fundamental nature that it is a positive advantage to them not to keep them secret.