Humankind means people in general — all of us, as a group. The future of humankind is the future of people on earth.

Humankind meanshumankind的意思是 people in general廣義的「人」 all of us, as a group也就是我們全體，當成一個群體 The future of humankind is the future of people on earthhumankind的未來，指的就是地球上人類的未來

It is a little formal, the kind of word you find in speeches, science writing, and careful talk. It is a twin of mankind. Both use -kind in the old sense a type of being / a race, not kind as in nice.

It is a little formal這個字有點正式 the kind of word you find in speeches, science writing, and careful talk是那種會出現在演講、科學寫作和用心措辭裡的字 It is a twin of mankind它是mankind的雙胞胎 Both use -kind in the old sense兩個字的-kind都是取古老的意思 a type of being / a race「一種存在／一個族類」 not kind as in nice不是「親切」的那個kind

Humankind is the form many teachers now prefer, because mankind can sound as if it names only men, even though it was long used for everyone. Though actually, both words are still understood, and in everyday talk people often just say people, or the world, or humanity. You do not need humankind to buy fruit; you need it when the subject is the whole human group.

Humankind is the form many teachers now preferhumankind是現在很多老師比較偏好的說法 because mankind can sound as if it names only men因為mankind聽起來可能只指男性 even though it was long used for everyone儘管它長久以來其實泛指所有人 Though actually不過其實 both words are still understood這兩個字現在都還是聽得懂 and in everyday talk people often just say people, or the world, or humanity日常對話裡大家常常就直接說people、the world，或humanity You do not need humankind to buy fruit買水果不需要用到humankind you need it when the subject is the whole human group但講到整個人類群體的主題時就用得上