1.brag (vt&vi.)自大，吹嘘
In this video, we joke about Mark bragging about flying first class; however, if s just a joke because Mark usually flies economy.
在这段视频中，我们讲了一个关于马克吹嘘坐头等舱的笑话；不过，这只是个玩笑，因为马克经常坐经济舱。

2.frequently (adv.)频繁地
It's important that you use all of the words we teach on this show as frequently as possible.
重要的是你要尽可能频繁地使用我们在这个节目中教的所有单词。

3.luxurious (adj.)奢侈的
Mark says that flying first class is a very luxurious expression.
马克说坐头等舱是非常奢侈的体验。

4.context (n.)语境；上下文
It's very important to learn each new word in its own context, so you can fully understand its true meaning.
在上下文语境中学习每个新单词是非常重要的，这样你就能完全理解它的真正含义。