adv.运转着，生效...

in operation的音标：in operation的英式发音音标为：[in ˌɔpə'reiʃən]in operation的美式发音音标为：[ɪn ˌɑpə'reʃən]...

A contraflow system is in operation on this section of the motorway.这段高速公路的一侧正在实行双向行驶。Until the rail links are in operation, passengers can only travel through the tunnel by coach.在铁路连线开通之前，乘客只能乘坐长途客车穿越隧道。Part of the new...