1·She noticed the slight hollows under his cheekbones.
她注意到他颧骨下面的轻微凹陷。
—— 《牛津词典》
2·The slash of her cheekbones created hollows in her face.
下凹的面颊骨在她脸上形成两处凹陷。
3·Most species make their nests on bare ground, and lay their eggs in shallow hollows scraped in the icy dirt.
大部分品种的企鹅在露天地上筑巢，将卵产在浅滩凹陷处，埋入冻土层中。
4·There are just a couple of small places untouched by either light: the dark area where the nose meets the eye socket, and the hollows above and below the ear.
只有一些小角落都没被照到：鼻子和眼窝交界的地方，耳朵上方和下方的凹陷。
1·For example, birds have hollows bones, and insects have no bones at all. But most mammals have solid and heavy bones, which could make flying tough.
比如，鸟有中空的骨头，昆虫根本就没有骨，而大部分哺乳动物都有坚固而又沉重的骨头，这就使得飞行变得很困难。