second在句首的用法

second在句首的用法？

1.Seconds later, firemen reached his door.片刻之后，消防队员们赶到他家门口。

2.He was seconded to the Sales Department for two years.她被临时调派到销售部去工作两年。

3.She's been seconded to the foreign office.她已被临时调派到对处办公室。