He once told me that he was very nervous at first. He was not only trying to learn this hard new job but also a new language.

他曾经告诉我他一开始很紧张。他不仅在努力学习这一艰难的新工作，而且在努力学习一门新的语言。

youdao

Many things in the country are now waiting to be done, but at present they are not able to do the things all at once.

这个国家现在是百废待举，但目前他们还不能做到百废俱兴。

《新英汉大辞典》

You start feeling not really good, but you've done this before. At least once.

你就会感觉不太好，但是你以前不止一次地做过相同的事。

youdao

Torrey says he was lucky to visit it not once,but twice, at the June and December solstices.

VOA: standard.2009.12.15

Or as someone else put it, you may be able to have it all but not at once.

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SmartGlass licenses one instance of the title across its connected devices, so that a film can be watched on the Xbox-connected big screen or the smaller-screen device, but not both at once.

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Some of the involuntary cues that betray whether a speaker is lying could be controlled, but not all of them at once.

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