2. When you grin, you smilebroadly and your teeth could be seen by others. Usually it shows your great happiness.
但你开怀大笑，你会嘴角上扬，露出牙齿——只有当你真正开心，才能笑得开怀！
youdao
3. Cash registers ring and store managers smilebroadly as merchandise moves from counters and tables into shopping bags.
当货物从柜台和桌子装入购物袋时，现金出纳机响个不停，商店经理则笑开了怀。
youdao
4. Scream, cry, laugh wildly, smile broadly. You will never know your emotional comfort zone if you don't allow yourself to feel and express yourself.
尖叫、哭泣、疯狂地笑、满面笑容。如果你不允许自己感受和表达自己，那你永远不会知道你的情绪的舒适区。
youdao
5. "He experimented with smiling broadly when he met new people," they write. "when no one reacted in horror, and in fact responded positively, he began to feel at ease with his smile."
