Can you boil some potatoes for me? I'm making potato salad.
你能帮我煮些土豆吗? 我今晚要做沙拉酱。
If you want a thing (well) done, do it yourself.
要想做好事情,就要自己动手。
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.