explain sth to sb
to give a reason, or be a reason, for sth
說明(…的)原因；解釋(…的)理由
She tried to explain but he wouldn't listen.
她試圖說明一下原因,可他根本不聽。
Alex explained that his car had broken down.
亞歷克斯解釋說他的汽車出了毛病。

brave
勇敢的；無畏的
同義詞：courageous
brave men and women
英勇無畏的男女
Be brave!
勇敢一些！
I wasn't brave enough to tell her what I thought of her.
我當時沒有勇氣告訴她我對她的看法。

look after
look after yourself
look after sb
look after sth
(especially BrE) to be responsible for or to take care of sb / sth
對…負責；照料；照顧
Who's going to look after the children while you're away?
你不在時誰來照料小孩？
I'm looking after his affairs while he's in hospital.
他住院時由我處理他的事務。

injured
受傷的；有傷的
an injured leg
受傷的腿
Luckily, she isn't injured.
幸運的是,她沒受傷。
Carter is playing in place of the injured O'Reilly.
卡特替代受傷的奧賴利上場比賽。

來源:可可英語 http://www.ccdyzl.cn/video/201704/499621.shtml