In calculating the daily calorie requirements for an individual, variations in body size, physical activity, and age should be taken into account.

Some cosmetics manufacturers attempt to capture the rose's unmistakable fragrance香味 in soaps and perfumes.

Some sea urchins海胆 have venomous (toxin) spines

The Salk vaccine is a major factor in the fight to eradicate polio.

With the acquisition of smaller companies by larger ones, the 1960's saw a wave of new conglomerates.

The controls of most modern airplanes can be operated either manually or automatically.

Some children display an unquenchable 难以抑制的 curiosity about every new thing they encounter.

In 1861 it seemed inevitable that the Southern states would break away from the Union.

Mary McCarthy s satires 讽刺文学 are couched in a prose style that has a classic precision.

The future survival of the bald eagle is still an important American ecological concern.