空气﹑食物﹑水皆为生命不可或缺者。
让每一个参与者都都扮演着重要的互相联系而非不可或缺的角色。
So that each actor plays an important dependent but not indispensable role.
大多数管理者反而并不重要，但一些基层实干者却是绝对的不可或缺。
Most managers were not very important but several doers were absolutely vital.
大多数管理者反而并不重要，但一些基层实干者却是绝对的不可或缺。
Most managers were not very important but several doers were absolutely vital.
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