That naughty boy seems to tell his family too many lies.
这个顽皮的小男孩似乎对家人说了很多谎。
I would not waste my time pursuing that.
如果是我的话,不会将时间浪费在这里。
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.