In a world as tightly connected as ours is, don't restrict your attention to American or Western culture.

【翻译】在一个像我们这样的密切相连的世界里，不要把注意力局限在美国的或西方的文化上。

【分析】In a world as tightly connected as ours is，总体是个介词词组。在这里面，包含着一个形容词短语as tightly connected as ours is，作定语修饰world。connected是形容词“有联系的”。为了理解方便，我演绎一下句子：

In a connected world：“在一个国与国之间有联系的世界里”。connected是形容词，作定语。

In a tightly connected world：“在一个国与国之间有密切联系的世界里”。connected前加副词tightly 修饰，意为“有密切联系的”。

In a world which is as tightly connected as ours is：“在一个像我们这样的密切相连的世界里”，加了一个定语从句，而且用了tightly connected 的原级比较。

In a world as tightly connected as ours is：意思同上句。将定语从句简化，变成形容词短语作定语。