The other -- which sort of sounds like ru -- exists in French but not English.

另一种发音有点像 ru，存在于法语中，但不存在于英语中。

So, ru, or ur, so it's the verb " to be" , the form " are" , okay?

所以，ru 或 ur， 所以词“to be”，“are” 形式，好吗？

They feared the move would strengthen government power over the country's cyberspace, which is called " Runet" because the country's internet addresses end in " ru" .

他们担此举会强化政府对该国网络空权力，其网络空被称为" Runet" ，因为该国互联网地址以" ru" 结尾。

Some languages, like Japanese, have few distinct sounds and tight rules on how syllables may be structured, so that the number of possible syllables is low (think ka, ru, to, etc).

有些语言，比如日语，很少有清晰发音，音节结构也有严格规则，所以可能音节数量很低(比如ka, ru, to等等)。