file away造句

1、I saw the PLA men file away a moment ago.
刚才我看见解放军战士列队出发。

2、You have to file away for hours to get this metal smooth.
你得锉上几个小时才能使这金属变得光滑。

3、I admire the ingenuity and file away the idea for possible use in the future.
我佩服他们的想象力，并把这个想法归档以备将来之需。