guān / yú / zhè / jiàn / shì / liǎng / ge / rén / bǐ / cǐ / xīn / zhào / shuí / yě / méi / yǒu / duō / shuō

关于这件事，两个人彼此心照，谁也没有多说。

The two of them understood each other tacitly about the matter, and neither said much.