The bird tucked its head under its wing.

把头缩进翅膀。

A cat retracts its claws.

猫缩进它的爪子。

A tumblebug came next, heaving sturdily at its ball, and Tom touched the creature, to see it shut its legs against its body and pretend to be dead.

不久，又有一只金龟子飞过来， 不屈不挠地在搬一个粪球；汤姆碰了一这小东西，看它把腿缩进身体装死。