It is likely that the "s" strain is the ancestral species because it is found all over sub-Saharan Africa, whereas the "M" strain is concentrated on central and west Africa.

S类可能是更原始的种群因为它被发现存在于撒哈拉沙漠以南的非洲的各地。

youdao

Leading members of the Coalition will be holding a press conference at the National Press Club's West Room at 10:00 a.m.

CENTERFORSECURITYPOLICY: Coalition to Stop Shariah press conference 11/6

But I'm not quite so sure about another suggestion which has followed the West news, It's Grim Up North.

BBC: A boy named North West

The U.S. native, who studied in the West, discussed the merits of earning an M.

WSJ: Hong Kong M.B.A. Program Won Elite Status Fast