It risks closing down the space for reasoned debate and subverting the principle of freedom of speech.

不但给理性辩论空间造成了威胁，也违反了言论自由的原则。

The place we typically start in thinking about the subject is the First Amendment and the sacred principle of freedom of speech.

我们通常从美国宪法《第一修正案》和言论自由的神圣原则开始思考这个问题。

Mr. Barroso also called against any attempt by the British government to limit the principle of freedom of the movement within the Union ahead of a possible referendum on membership.

巴罗佐再次表示反对英国政府的任何举动，目的是在就其会员国地位进行公投之前限制其在欧盟内部的行动自由。