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

An oversight 遗漏 (miss, overslaugh) in proofreading often results in printed errors.

Someseaurchins海胆havevenomous(toxin)spines

The first paper was made from the bark of the mulberry tree.

The fear of smallpox, which terrorized the eighteenth century, has no analogy(likeness) today.