commercial
单词辨析：
泛指与商品和服务的买卖有关的，通常作定语。
He failed to see the commercial value of his discovery.
他没有意识到自己的发现所具有的商业价值。
Is commercial correspondence taught at your college?
贵院是否教授商业函件写作?
指与贸易和商业活动有关的，只作定语。
Obey the mercantile laws if you are engaged in business.
如果你经商，应该遵守商法。
A new Chinese mercantile agency was established in New York.
中国一家新的商业征信所在纽约成立。
非正式文体中可写作 ad，通常内容广泛、形式多样。
There is an advertisement on the wall which says:'Help Wanted.'
墙上贴了一则招聘广告。
There are so many advertisements in the newspaper.
报纸上广告实在太多了。
词义同 advertisement，可换用。
Have you read the advert/advertisement in the newspaper?
你读过报纸上的那条广告了吗？
The advert/advertisement is to sell medicine.
这则广告是卖药的。
专指电视台或电台播放的产品宣传广告。
a toothpaste commercial
牙膏广告
The TV play was interrupted by too many commercials.
那个电视剧中插入的广告太多了，频频被打断。
A good commercial convinces people of the attractive features of a product.
好广告能让人们相信产品的亮点。
相关例句：
Our correspondence is limited to a few commercial letters.
我们之间的通信只限于几封商业函件。
In one sense, the fact that few new commercial buildings can be financed does not matter
从某种意义上说，只有少数新建商业大厦可以融到资金的情况其实并不重要。
There's a feeling among a lot of people that music has become too commercial.
很多人都觉得音乐变得过于商业化了。
The commercial telephone service was no longer operative
商业电话服务已不再运营。
In the commercial an announcer interviews a Texan.
在这则广告中播音员采访了一个得克萨斯人。
British Rail has indeed become more commercial over the past decade
过去10年来，英国铁路确实变得更加商业化了。