In particular, it is customary for actual examples of use of the harmonic mean to generally cover "average speed," and explain no further than that.

Cats usually hate dogs.

When parents get old in Japan, they are customarily looked after by their children.

As a rule, we don't allow smoking.

Truth is usually expressed in the present tense.

As a rule, we have three meals a day.

Cats usually hate dogs.

About 14,000 of these usually have tickets for the Center Court.