1.frown vi. 皱眉；不同意

如： She frowned down all her opponents.
她用皱眉使反对者缄口。

And trembled with fear at his frown.
而当他皱眉时她却因担心而颤抖。

Smile at People. It takes 72 muscles to frown, but only 14 to smile!
要向人们微笑。皱眉需要72块肌肉，而微笑只需要14块！

2.grateful adj. 感谢的；令人愉快的，宜人的

如：When we stop and tell our partners what we are grateful for, we are also telling the Universe.
当我们停下来，告诉我们的伴侣我们想要感谢的事，我们也是在告诉整个宇宙。

When you are grateful, then gradually people can let go of their resentment, their anger and discover their own beauty.
当你是心存感激的，渐渐地，人们就能放下他们的愤恨和怒气，发现他们自身的美好。

3.invisible adj. 无形的，看不见的；无形的；不显眼的，暗藏的

如：For example, air is invisible.
例如，空气是看不见的。

That makes most of the seams invisible.
这使得大部分煤层看不见的。

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