非主流的英文：
alternative
non-mainstream

参考例句：

Like early experiments with ham radios,electronic magazines are finding alternative ways of reaching the masses
如同早年的业余无线电实验，电子杂志正在寻找通向大众传播的非主流途径

They intend to be a media "watchdog" and get the media to focus more on "non-mainstream opinions".
他们要"监督"本地媒体，是要促使媒体多报道"非主流"意见。

alternative是什么意思：
adj. 供选择的；两者择一的；交替的；非正统的
n. 二中择一；供替代的选择；可供选择的事物

Are there alternatives to prison?
除了监禁还有其他办法吗？

should alternately present as undulate .
激情平淡应呈波浪形交替出现。

There are two reasonable alternatives.
有两个合理的替代方案。

non是什么意思：
pref. 非；不

The alkanes are non-polar.
烷是非极性的。

non-bumper seesaw
防撞跷跷板

non-Euclidean norm
非欧几里得范数

mainstream是什么意思：
n. 主流

They cover issues that receive little attention by mainstream media.
他们报导不受主流媒体关注的议题。

We speak for the minorities who have not yet entered the mainstream.
我们为尚未进入主流的少数群体说话。

Immigrants who were absorbed into the social mainstream.
移民被社会的主流同化了