[文法] 請問that用法

[teddyisgood (我愛$$)]

如題
It is quantity that people are consuming that is harmful.

我不了解第二個that 是哪一種用法？
因為我直接想成It is quantity that people consuming is harmful.

感謝

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→ ambrosio: 強調句it is ...that的用法
→ teddyisgood: 我不是說第一個that
推 jtmh: It is [quantity that people are consuming] that [is
→ jtmh: harmful. 是第二個 that 沒錯
→ teddyisgood: 喔喔 ok 感恩
→ teddyisgood: http://i.imgur.com/Dxjn9zn.jpg
→ teddyisgood: 對了我想順便問一下 我畫螢光筆的that是什麼用法 感
→ teddyisgood: 謝
※ 編輯: teddyisgood (101.14.66.250), 12/19/2016 15:36:11
推 jtmh: 上面的 that 當關係代名詞，相當於 which
→ jtmh: there's not much [that's reassuring]