To say "I love you" one must first be able to say the "I."

要说“我爱你”，首先必须能够说出“我”。

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The simple explanation is that in order to get down a slope one must first get up it, which was far from easy before the advent of the ski lift.

（简单的解释是为了下坡，人必须先上坡，在没有吊椅出现之前没有那么简单）。

youdao

To answer this question, one must first track the source of the problem.

要解决这个困惑，首先要找准问题的根源。

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The judge promised there would be one. But,he says,for that to happen, Karadzic must first appear in court.

VOA: standard.2009.10.26

To answer that question, one must first understand the difference between how business and consumer marketing operate.

FORBES: B2B Marketers Take Their Seat at the Table

To get into the cave one must first descend by rope to the bottom, which can be a somewhat daunting experience for a first-timer.

FORBES: By Sonya Angraini (Forbes Indonesia)

To understand, one must first go back thousands of years to Phoenician times, when black-hooved pigs (another name for the breed is pata negra, or black hoof) were introduced to an oak-grove ecosystem in southwestern Spain known as the dehesa.

WSJ: Debut: Jam��n It Up, Legitimately: Get Iberian Ham in the U.S.