useful
adj. /ˈjuːsfl/ A2
有用的；有益的
Helping you to do or achieve what you want.
仙境例句
After that day, the Rabbit said a long ladder was the most useful thing in the whole town.
从那天起，白兔就说一架长梯子是全镇最有用的东西。
原著这一句
And it’ll fetch things when you throw them, and it’ll sit up and beg for its dinner, and all sorts of things—I can’t remember half of them—and it belongs to a farmer, you know, and he says it’s so useful, it’s worth a hundred pounds!
而且你扔东西它会捡回来，还会坐直讨饭吃，还有各种各样的本事——我都记不得一半了——而且它是属于一个农夫的，你知道的，农夫说它特别有用，值一百英镑呢！
卡罗尔原著 · 第 2 章