This is owing to …、due to …、a result of … 、because of …
注：owing to 通常用于不好的消息。如果想在原因中使用动词，请加上the fact that的从句。
increase prices --- fall of the dollar
We have been force to increase our prices. This is owing to the fall of the dollar.
Delay the delivery of the goods --- strike by airline pilots
We have been forced to delay the delivery of the goods. This is owing to the strike by airline pilots.
Increase all salaries by 10% --- rise in sales
We are able to increase all salaries by 10%. This is the result of a big rise in sales.
Cut all salaries by 10% --- fall in sales
We have been forced to cut all salaries by 10%. This is due to the fact that there has been a fall in sales in the past ten months.
Cannot deliver your new order --- we have not received your payment fro the last order
We regret that we are unable to deliver your new order immediately. This is owing to the fact that we have not received your payment for the last order.
Cancel the meeting --- a lot of staff have been ill
We have been forced to cancel the meeting. This is because some members of our staff have been ill.