请问：

1）网站上最新的文章有Highlights,但是Submission checklist又没有，投稿时需要把Highlights加在文章最后吗？

2) 这个期刊需要cover letter吗？Submission checklist里没有，哪里可以看到需不需要呢？如果投稿系统里面有这个选择项，是不是一定需要？

3) 这个期刊没有要求Abstract的字数, 但是投稿时要求150字以内，有投过该期刊的吗？要把原来的摘要改短吗？

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Submitting an Abstract is Required for Submission.

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If you edit your Abstract in the text box (for example to make it shorter), please copy and paste this version of your Abstract into your manuscript file.

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（Limit 150 words）
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