It is necessary to write an outline before the first draft of the composition.

在写作文初稿前有必要写个提纲。

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You can write an outline to remind you of what you want to say later.

你可以写个提纲，来提醒自己等会儿想说的话。

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You can write an outline to remind you of what you want to say later.

你可以写个提纲，来提醒自己等会儿想说的话。

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