Troy stepped forward and whistled a double note.

托伊迈步向前，用口哨吹了一个双音。

youdao

But the number of patients getting the medicine could double, according to a research note from James Reddoch, biotech analyst at Friedman, Billings, Ramsey.

FORBES

At any rate, note the cynics, it will mean double entrance money.

ECONOMIST: Goethe

Note that there is likely to be some double-counting of STEM workers working in tech industries.

FORBES: Methodology For Forbes' Best Cities For Tech Jobs List