Sentence examples for are usually more difficult from inspiring English sources

Because of these two considerations, experiments with clusters are usually more difficult than those with either specific molecules or bulk matter.

Mesenchymal stem cells (MSCs) are usually more difficult to transfect [35].

Since symbolic algorithms are usually more difficult to implement, there are also very few computer algebra systems.

These masks allow an efficient filtering even for higher modes which are usually more difficult to filter.

Energy systems have external costs as well, such as environmental costs, although they are usually more difficult to quantify in energy terms (Cleveland and O'Connor 2011).

In contrast to the motivations of a suicide bomber, which are intentionally well-publicised, those behind a murder-suicide are usually more difficult to fathom.

And while managing financially is usually more difficult for widows, widowhood tends to be more harmful to the health of men.

That's usually more difficult for us, only because we have to haul seven astronauts weighing about 240 pounds with their gear, up this tiny little hole and they can get snagged on every little thing coming up Q.

In cases in which the atom that is substituted is linked to the rest of the molecule by only one bond, the bond involving the heavier isotope is usually more difficult to break than the one involving the lighter isotope.

Therefore, it is usually more difficult to solve them for very small parameter ϵ.

This is a more serious attack, since it is usually more difficult to detect and to be counterattacked.