talk and laugh cheerfully/merrily

Cheerful people are usually lively and outgoing, and often smile in interpersonal communication, but that doesn't mean they can't show seriousness, concentration and seriousness. A person's emotional expression and conversation style largely depend on his emotional state and conversation content. Therefore, in a normal conversation, when the conversation is serious and heavy, a person will show more focused and calm emotional expression; When the conversation is light and witty, he will show more lively and excited emotional expressions. This is not to say that a person is not serious, but shows different emotional expressions according to the content and emotional state of the conversation.

The word "earnest" itself does not refer to specific emotional expression or facial expression, but refers to a kind of thinking and behavior attitude. Serious attitude usually refers to the attitude when thinking and dealing with problems seriously, including attention and concern for problems and understanding of the responsibilities of oneself and others. In interpersonal communication, a serious attitude may be reflected in your serious concern for each other's problems, doubts and needs, and your responsible attitude towards what you say.

Therefore, in interpersonal communication, we should not only express different emotions according to the content of the conversation, but more importantly, we should hold a sincere, respectful and responsible attitude according to our own thinking and attitude. This sincere attitude and trust can help people build good interpersonal relationships far more than a smile or a serious expression.