Many schools use small classes as their trump card in marketing campaigns.
很多学校在做宣传活动
都把小班授课当成他们的王
。
（最有效的谋略）Many schools use small classes as their trump card in marketing campaigns.
很多学校在做宣传活动都把小班授课当成他们的王。
This defender’s ability to score vital goals has often proved a trump card.
防守队
在关键
球得分的能力常常成了整个队的制胜法宝。
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