Etiologies included trauma, steroid use, and idiopathy.

病因包括外伤，类固醇使用和自发病。

youdao

Also, steroid use and illegal drug use should be avoided.

此外，甾体激素类使用和违禁药物使用也应当避免。

youdao

Across America, between 1991 and 2003, steroid use in high schools more than doubled.

1991到2003年全美国高中生使用的类固醇增加了两倍多。

youdao

As of 2005, 6.8% of male high schoolers admitted steroid use, as did 5.3% of females.

FORBES: 32 Indicted in Steroid Ring That Targeted High School Athletes

By the way, steroid use among high schoolers is not a U.S. problem only.

FORBES: 32 Indicted in Steroid Ring That Targeted High School Athletes

Major league baseball has launched an investigation into alleged steroid use among its players.

NPR: Major League Baseball to Investigate Steroid Use