have been developing since
一直在发展
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Audience engagement and participation have been developing since the cultural upheavals of the 1960s, said Kristin Linklater, a professor of theater arts at Columbia.
WSJ: Culture City: Eats and Tweets in the Seats
The play's themes have been developing since Sept. 11, 2001.
WSJ: Bari Weiss: David Mamet's Coming Out Party
Fischer and Sheeley say they have been developing their Android applications since last November.
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