and promise to carry her secret to your grave, 并保证死也不说出她的秘密
Like treehoppers, they, too, communicate in secret - 如同角蝉 豺也在秘密交流
The secret of success in the competitive jungle is specializing 在激烈的雨林竞争中取得胜利需要一些秘密手段
but this desert river holds a secret. 但是这条沙漠河流却藏着一个秘密
The secret is a cold sea current that runs parallel to the land. 答案就是一股与陆地平行的寒冷洋流
but the snakes have a secret weapon. 不过蛇也有自己的秘密武器