grinning/ɡrɪn/名词露齿笑，咧嘴笑，龇牙笑a broad/sheepish grin合不拢嘴的笑／腼腆地咧嘴笑/ɡrɪn/动词露齿笑，咧嘴笑，龇牙笑What are you grinning about?你龇牙咧嘴笑什么？想跟读，去练习
