英语语法分析

Ruben Sergeev said the country was afraid of falling behind in a new arms race.

鲁本·谢尔盖耶夫说该国害怕在新一轮军备竞赛上落后。

More scientists and other studies are now challenging the same premise, Ruben said.

现在更多的科学家和其他研究正在挑战一个相同的假设，鲁本说。

Ruben Sergeev, an expert on disarmament issues, said Moscow was afraid of falling behind in a new arms race.

裁军问题专家Ruben Sergeev说莫斯科害怕在新一轮军备竞赛上落后。