jackknife的现在完成时怎么拼写？

jackknife的现在进行时为：jackknifing...

Yes, simple ones like the swallow and jackknife but not fancy diving.跳的, 跳简单的例如燕式、弯身式,但不会跳花式.But, yahoo still is put in jackknife government issue.但是, 雅虎仍存在重叠管理问题.Two periodic jackknife, be helpful for national economy g...

jackknife的音标：jackknife的英式发音音标为：['dʒæknaɪf]jackknife的美式发音音标为：['dʒækˌnaɪf]...

jackknife的第三人称单数（三单）为：jackknifes...

n.折叠刀v.对折，用折叠刀切...

jackknife的一般过去时为：jackknifed...