I hadn't a clue as to the meaning of 'activism'.

我对 activism的意思一无所知。

They should look up the meaning of the word in the dictionary.

他们应该在字典里查一下这个词的意思。

I became more aware of the symbols and their meanings.

我更能理解信号及其意义了。

Unsure of the meaning of this remark, Ryle chose to remain silent.

由于对这个评论的含义不确定，赖尔选择了保持沉默。

Art has real meaning when it helps people to understand themselves.

当艺术有助于人们了解自身时，才有真正的价值。