Try to keep calm and just tell me what happened.

试着保持冷静，告诉我发生了什么。

《柯林斯英汉双解大词典》

Try to relax and keep calm.

尽量放松保持镇静。

youdao

Keep calm, and try not to panic.

保持镇静，不要慌张。

youdao

All in all, I found university life is so much different from life in high school. Keep in mind that you must try your best to calm yourself in high school in order to meet another big challenge.

总的说来，大学的学习生活的确比高中学习生活要困难的多，所以，希望在英华的学弟学妹们，要保持心态，在高中阶段尽你最大的努力充实你自己，是为了迎接更大的挑战。

youdao

All in all, I found university life is so much different from life in high school. Keep in mind that you must try your best to calm yourself in high school in order to meet another big challenge.

总的说来，大学的学习生活的确比高中学习生活要困难的多，所以，希望在英华的学弟学妹们，要保持心态，在高中阶段尽你最大的努力充实你自己，是为了迎接更大的挑战。

youdao