How they have been able to sustain this level has been unbelievable for me to watch.
Times, Sunday Times
But no one should be too surprised if he manages to sustain his level of success.
The Sun
We couldn't sustain the level in the second half because we didn't have the required fitness.
Times, Sunday Times
In the end, it simply became too exhausting to sustain that level of anxiety.
Times, Sunday Times
And if he can sustain that level throughout this week, great things can happen.
Times, Sunday Times