doing blank
做空白
以上为机器翻译结果，长、整句建议使用 人工翻译 。
It's very easy. Just fill in the blank with whatever action it is that you are doing.
这一点也不难，只要把空着的地方填上你正在做的事就行了。
I'm ~ing 课堂 - SpeakingMax英语口语达人
Five years ago, if you asked executives at high-end automakers like Bentley and Ferrari what they were doing to improve the fuel economy of their vehicles, you would get blank stares.
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