He admitted that it is difficult to execute the plan, saying 'it is easier said than done.'

When an object is in free fall, its terminal velocity is determined by the balance between gravity and air resistance.

He should keep his promise.

Arthropods are a large group of animals that include insects, spiders, and shrimp.

The associative law is one of the basic laws of mathematics.

In mathematics, the commutative law applies to addition and multiplication.

The distributive law is one of the basic laws of mathematics.

This phenomenon follows a specific law.

This school has strict rules.

This car is equipped with an automatic transmission.