9. Then the salesmen have to refresh themselves frequently since we keep producing new products.
我們不斷生產(chǎn)新產(chǎn)品，因此銷售人員必須經(jīng)常更新自己。
還能這樣說：
The salesmen have to keep constant refreshing as we always update new products.
It is necessary for the salesmen to refresh themselves with the products being produced continuously.
應(yīng)用解析：
refresh one's memory 使某人想起
例如：
Just refresh my memory: were you born in York?
請(qǐng)?jiān)俑嬖V我一次：你是在約克郡出生的吧？

10. We must accelerate our advertising.
我們必須加快廣告宣傳的速度。
還能這樣說：
We must speed up the advertising.
We must propagate the products in a more rapid speed.
應(yīng)用解析：
accelerate的意思是：使增速；促進(jìn)，促使……早日發(fā)生；使加速。
例如：
We must accelerate the output.
我們必須提高產(chǎn)量。

11. You won't reach all your potential customers with your present methods.
以目前的方式，你無法觸及到所有的潛在顧客。
還能這樣說：
If you insist on your current methods, you will never reach all your potential customers.
With the present methods, and you won't attract your potential customers.
應(yīng)用解析：
have method in one's madness 貌似瘋狂而實(shí)有理智的行為

12. Salesmen have to attend a refresher course frequently.
銷售人員必須經(jīng)常參加進(jìn)修課程。
還能這樣說：
Salesmen need to review the training frequently.
Salesman has to take part in the training program now and then.
應(yīng)用解析：
off course 不在規(guī)定的過程中；
base course 基層；
be on her course 航向不變；
course of action 做法；行動(dòng)步驟；
golf course 高爾夫球場(chǎng)