However, operation mode has to be selected in operation. There are many different structure and design issues when choosing either constant or sliding-pressure operation.

使用中面临着如何选择机组的运行方式问题，选择恒压或滑压运行在结构和设计上均有许多应考虑的不同问题。

youdao

However,he says the repatriation operation cannot go ahead until the Mauritanian and Malian governments agree on how the returns will be carried out.

VOA: standard.2009.10.24

This time however, the operation has been serious and remarkably successful.

ECONOMIST: Pakistan's Swat valley

That was a distinct operation, however, because Giffords also required a neurosurgeon to perform a craniotomy.

CNN: Man's eye saved after impalement

Concerted pressure from aid donors would win his co-operation, however reluctant, in bringing Khmer Rouge leaders to trial.

ECONOMIST: Try the Khmers Rouges