Xanax is one of a class of drugs known colloquially as "benzos" (benzodiazepines) that are safe and highly effective - but can also be addictive and have potential for abuse.

阿普唑仑是一类俗称“苯二氮平”的药物。这类药物安全有效，但是也可能让人上瘾并被滥用。

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Class 35 or 40 minutes from the efficiency of not only the classroom, prepare a lesson in class can also be highly effective.

课堂35或40分钟的效率不仅仅来自于课堂，预习也可以使课堂达到事半功倍的效果。

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It analyzed what was wrong with competing services and sought out sites that were best-in-class when it comes to things like displaying beautiful photographs or creating a search function that produces highly effective results.

FORBES: The World's Hotels Are Oyster's Oyster