原文:A Smart Battery signals the SMBus Host that it has detected an
unrecoverable error by taking advantage of the SMBus requirement that an
acknowledge bit must be sent by the slave after every byte is transferred.
一個完整的句子S+V+O(A smart battery signals the SMBus host)
後面的that應該是補語吧?
那第二個that又是什麼呢?補語應該從that it has....到....SMBus requirement而已吧?

這文章的用法好奇怪。應該是signal sb to do sth，可是這裡卻是signal sb sth(用名詞子句的形式)。應該是take advantage of sth (to do sth)，可是這裡卻是take advantage of sth sth(用名詞子句的形式)。還是有請其他高手解答...orz

http://www.learnersdictionary.com/definition/signal2 signal verb -> 2 ... 第二部份 第一個例句這類似"tell"的用法

謝謝d大，想請問第二個that也是同一個用法嗎?所以第一個that後面的it是指Smart battery囉?