你并不是不可替代的。
So that each actor plays an important dependent but not indispensable role.
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。
Sound should enhance your site but not be indispensable.
声音可以点缀你的站点，但并不是必不可少的。
Time is always an indispensable person becomes not essential.
时间总是可以把一个不可或缺的人变得可有可无。
Of course, we can not deny the fact that self-learning is also indispensable.
当然，我们不能否认，自学也是必要的。
Of course, we can not deny the fact that self-learning is also indispensable.
当然，我们不能否认，自学也是必要的。
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