战书 meaning in English

written challenge to war; letter of challenge

Letters from iwo jima special edition japan version
硫磺岛战书特别版日本版
They are hunting the same nemesis so richmand must reconcile his desire to unmask silver hawk with his need for her help to fight the greater evil . .
飞鹰处处阻挠其计画，火狼遂下战书约晤飞鹰一较高下
Participants will learn the importance of nature conservation while enjoying a leisure walk in the countryside or taking a challenge in a natural environment
自然探索者为以悠闲方式欣赏及了解大自然，而自然挑战者则接受大自然发出的战书，挑战体能。
Eight years ago , despommier challenged the public health students he teaches to come up with a system of growing food for the world that would reduce the risk of disease
八年前，迪斯波米耶向他教的公卫学生下战书，要研究出一套既可为世界生产粮食，又可降低疾病的体系。