listen for怎么用？？

listen
for:
注意倾听(期待的声音等)
例句与用法:
1.
She
shouted
on
the
mountaintop
and
listened
for
the
echo.
她在山顶上大声喊着，然后聆听着回声。
2.
For
over
two
hours,
her
arrival
had
been
listened
for.
足足有两个多小时，人们一直等待着听她到来的声响。

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