标题：

请分析句中句子成分及part的意思：it was the part of the six hundred to do and die.

正文：

it was the part of the six hundred to do and die.

上次这个句子老师们讨论过，但当时背景材料不多。

我这次提供背景材料，希望老师们能再分析一下：

1. part是什么意思:1.本分,职责 2.部分

2. it是不是to do and die的形式主语？

背景材料1：

But the gulf between the mature or adult products and the experience and abilities of the young is so wide that the very situation forbids much active participation by pupils in the development of what is taught. Theirs is to do—and learn, as it was the part of the six hundred to do and die. Learning here means acquisition of what already is incorporated in books and in the heads of the elders. Moreover, that which is taught is thought of as essentially static. It is taught as a finished product, with little regard either to the ways in which it was originally built up or to changes that will surely occur in the future. It is to a large extent the cultural product of societies that assumed the future would be much like the past, and yet it is used as educational food in a society where change is the rule, not the exception.

背景材料2：the six hundred （《百度百科》轻骑兵的冲锋）

背景材料3：OALD9

the Charge of the Light Brigade

a famous attack by British cavalry (= soldiers on horses) during the Crimean War in 1854. An order was understood wrongly, and the soldiers, armed only with swords, were sent into a valley with heavy guns on both sides of them. 247 out of 637 men were killed. The event is remembered as an outstanding example of bad military leadership and the blind courage of soldiers obeying orders. It is described in a famous poem by Tennyson: “Forward the Light Brigade!’ Was there a mandismay’d? Not tho’the soldier knew Some one had blunder’d: Theirs not to make reply, Theirs not to reason why, Theirs but to do and die, Into the valley of Death Rode the six hundred.”