本期内容：

The world’s biggest tech companies agreed to a European Union code of conduct curbing hate speech and terrorist propaganda. Google, Facebook, Twitter and Microsoft promised to review most complaints within 24 hours, removing the offending material if necessary. But free-speech advocates worry that controversial and satirical material will fall victim to complaints from authoritarian or thin-skinned regimes.

词汇讲解：
Code of conduct: 行为准则
Curb：限制
Hate speech：仇恨言论
Propaganda：宣传
Offending：冒犯的
Advocate：拥护者
Satirical：讽刺性的
Authoritarian：专制者
Thin-skinned：脸皮薄