Think about the word and use it, in your mind, in a sentence.
想想这个字,然后去用它,在脑子里,在句子里。
I wonder if it is possible to arrange shopping for us.
我想能否在我们访问结束时为我们安排一点时间购物。
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.