这一句为什么多了动词 held ？We will be held responsible for their safety.我们对他们的安全负责.

Question

1. Oxidized cholesterol may be responsible for furring up the arteries.
氧化胆固醇可能是造成动脉堵塞的元凶。
来自柯林斯例句
2. I sometimes find it a strain to be responsible for the mortgage.
我有时觉得背负这笔抵押贷款很有压力。
来自柯林斯例句
3. Who will be responsible for the expedition's supplies?
谁将负责探险队的物资供应?
来自《简明英汉词典》

Answer 1

be responsible for 是指对某事负责
而be held(hold的过去分词，表被动) responsible for 则是指
someone else will come to you if things don't turn out right.
也就是someone will hold you responsible for something. 有人会拿你试问

We will be held responsible for their safety .
相当于We will be considered responsible for their safety.
If something go wrong with their safety, we are to blame.
其实翻译成中文基本上就是我们对他们的安全负责，(如果出了问题，我们承担责任）。
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而你给出的例句"Oxidized cholesterol may be responsible for furring up the arteries. "

这句就显然不能用到be held responsible for， 因为没有人会去找”Oxidized cholesterol”算账。

Answer 2

这句话是对的。牛津高阶辞典的例句，发给你，你看看。应该是一个惯用法吧。
◊ He is mentally ill and cannot be held responsible for his actions.
他有精神病，不能对自己的行为负责。追问

和 be responsible for 有区别吗？