But Bush administration officials say the potential for a sustained protest has grown in tandem with China's rising economic power.

Only after sustained protest by the international literary community was he released - nearly two bleak years later.

It was the first sustained protest in Hungary since 1989.

The climax came in sustained protests at the 1968 Democratic National Convention.

But Mexicans today seem totally unwilling to mount sustained protest, let alone a revolt, against such conditions.

Such sustained, guerrilla-style protest is new to Belarus, but not to Europe.

Then some even uglier buildings were erected, despite sustained protests.

It may be too early, though, to rule out the possibility of sustained protests by the militants.

Since early 2011, the country has experienced sustained protests and unrest inspired by the regional Arab Spring.

The challenge by the churches signals a new turn: now clergymen are calling for sustained protests.