Once the properties are visible you can click the property in the timeline with the option key held down. This will create a new keyframe at the time of the click.

按住键盘上的option键，点击时间轴上的属性，这将在你当前点击的时间点上建立一个关键帧。

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An earlier leaders meeting had to be canceled after anti-government protesters stormed a key venue where the summit was due to be held.

VOA: standard.2009.10.09

Read would have gone for eight had Robert Key held a regulation slip catch slightly away to his right off young seamer Neil Dexter.

BBC: SPORT | Cricket | Counties | Gallian boosts Notts title hopes

Feminist theologians argue that the lack of female disciples was not unusual two thousand years ago, and point instead to the key role held by other women in his life: his friends Mary and Martha, Lazarus's sisters, and the prostitute Mary Magdalene.

ECONOMIST: The pope's succession planning | The

"We have no way of knowing the duration or extent of this rally, but given all of the previous examples and the fact that all of the key indexes held above their October lows, we feel there is a good chance it could last several weeks, " writes Sullivan in a Thursday night hotline.

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