以下是我在看的一篇文章，两句不明，请指教：
And often it is necessary for our natural powers of observation to be supplemented by the most intricate of mechanical aids for a given object to become "empirical" in the sense just used.
to become 是修饰to be supplemented?
That social behavior does not lend itself to as quick and accurate description as, say, chemical behavior of gases and compounds does not mean that social roles, statuses, and attitudes are nay less emprical than molecules and tissues.
does not mean that的主语是？
