She was my firstborn.

她是我的长女。

《柯林斯英汉双解大词典》

Here, use my firstborn son as a lawn ornament.

在这里，你可以用我的长子点缀草坪。

youdao

Also I will make him my firstborn, higher than the Kings of the earth.

我也要立他为长子，为世上最高的君王。

youdao

So in Exodus 4:22, Yahweh tells Moses to say to Pharaoh "Thus says the Lord, 'Israel is my firstborn son.

所以在《出埃及记》第四章第22节中，耶和华让摩西告诉法老,“犹太人是我的长子“

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