great service的用法和樣例：
例句
- In doing so, he did a great service to the people.
他這樣做，就為人民辦了一件大好事。 - If you'll deliver this parcel, you will render me a great service.
如果你把這包東西送去，那就幫我的大忙了。 - The new discovery is bound to be of great service to mankind.
這項新發現對於人類必定大有用處。 - You did me a great service by showing me the truth.
你把實情告訴我了，這對我很有好處。
