Another 19 fell or unseated their rider, outcomes that cannot usually be predicted.
Whereas one history professor could in theory cover for another, a Russian lecturer cannot usually be asked to teach Italian.
But the scan and the treatment cannot usually be done at the same time, because they interfere with each other.
This was perhaps a reference to the British gulag, somewhere in the frozen tundra north of Bolton, which cannot usually be mentioned in the official UK media.
Husbands and wives cannot usually be compelled to testify against each other – though in some cases, such as domestic violence, they can.
In some ways, the low altitude preferred by the Black Hawk works in its favor; at treetop level, the helicopter cannot usually be seen until it is directly overhead.
But the committee concludes that assessing the cost of the FOI regime is difficult because the benefits that arise from the right to access information cannot usually be costed.
Although individual species cannot usually be identified solely from their footprints -- the tracks of a house cat, for example, resemble those of a baby tiger -- footprints are much more plentiful than fossil bones and can provide a more complete picture of the types of animals walking around.
This matrix cannot usually be measured directly.
However, these cannot usually be supplied at constant levels.
Diamond can be grown on such substrates; however, film detachment cannot usually be avoided.
