Some aquaculture critics doubt that aquaculture can keep growing at the current rate.

VOA: special.2011.02.08

Self learners have also told us that they are OCW eager to come to OCW often in order to keep current and the latest thinking in their field.

自学者告诉我们,他们渴望每天经常浏览,以便查询他们领域的最新思想。

麻省理工公开课 - 媒体、教育、市场课程节选

House Speaker Pelosi agreed, saying Congress and the Obama administration must keep the door open to additional steps, even as the current stimulus plan begins to work.

VOA: standard.2009.03.10