backfill的现在完成时怎么拼写

At last, some suggestions were raised for the concrete backfill mining.最后对具体的充填开采方法提出了建议.This article is good for promotion of backfill.本文对充填技术的推广,具有一定的参考价值.The upward drift stoping with backfill is a mining method with ...

backfill的音标：backfill的英式发音音标为：['bækfɪl]backfill的美式发音音标为：['bækˌfɪl]...

backfill的第三人称单数（三单）为：backfills...

vt.回填（挖掘的洞穴）...

At last, some suggestions were raised for the concrete backfill mining.最后对具体的充填开采方法提出了建议.This article is good for promotion of backfill.本文对充填技术的推广,具有一定的参考价值.The upward drift stoping with backfill is a mining method with ...

backfill的一般过去时为：backfilled...

backfill的现在进行时为：backfilling...