請問以下幾句英文該如何翻譯最為洽當？麻煩專業人士幫個忙，謝謝 「理字當前，客觀兼具，要如何讓自己說話更具說服力，這兩者要素是絕對不可少」?

Rational and objectivity, these are two essential elements required for your speech to be more persuasive.

坦白講，原文中文修辭實有跟英語的簡明結構有點難以共存，因此翻譯選取按英語的簡明結構和用詞，省略了中文中有些不必要的詞"當前"/"兼具"/"要如何"和句式，否則"按字全譯原文"便會變成：

The word "Objective" must come first, together with "Objectivity", this is how to let your speech to be more persuasive by these two essential elements.
跟中文原句一樣累贅難懂。

Lead with reason, while embracing objectivity — these are the two essential elements that will make your argument more persuasive.

"Be reasonable and be objective" - To make your argument more convincing, these two are the absolutely required secret sauces.