After this speech was made, the old couples crept into their shells, and never more came out.

讲完这番演说以后，这对老夫妇就钻进他们的壳里去，再也不出来了。

youdao

Explosive shells torn into the walls of the embassy.

爆炸的炮弹炸穿了大使馆的墙壁。

youdao

As their mortar shells slammed into the cement walls and aluminum roofs of our hospital, I called my daughters, who were both out of the country at the time.

当他们的迫击炮弹重重落在我们医院的水泥墙和铝制屋顶上的时候，我拨通了女儿的电话。她们当时都在国外。

youdao

More recently, the federal government, along with Delaware and New Jersey, tried to improve the wild-shellfish habitat by dropping millions of clam shells into the bay, which helps oysters mature by giving the larvae something to attach to.

WSJ: Planting Seeds for a Better Oyster Harvest

Once the balls stopped bouncing, the rovers shucked off their shells and emerged into the Martian light.

NEWYORKER: The Martian Chroniclers

These hermit crabs strike fear into the hearts of seated airline passengers whenever they board, because their shells invariably bang into innocent shins all the way to their seat.

ECONOMIST: Nomads at last