先天下之忧而忧，后天下之乐而乐的英文：
be concern about the country and the people before anything else.
n. 关心的事；关心，顾虑；关系，有关；公司，企业
v. 涉及，参与，关系到；使关心，使担忧
There is no cause for concern.
不必担心。
of or concerned with choreography.
属于或关于舞蹈艺术的。
They have no concern with the dispute.
他们和那纷争没有关系。
prep. 关于；大约；从事于；在…到处
adv. 附近
adj. 在附近的；即将...的
There was nobody about.
附近没有人。
Stereotypes about adultery are as common as research about it is flaky.
奇怪的是：这种陈词滥调和关于通奸的研究一样普遍。
She has a complex about rats.
她对老鼠有病态恐惧。