提示：点击例句中的单词，就可以看到词义解释

Books were just a commodity that had to be produced , like jam or bootlaces .

书籍不过是需要生产的商品，如同果酱或者鞋带一个样。

She had learned to walk , and to talk , and to feed herself and tie her bootlaces .

她学会了走步、说话、吃饭和系鞋带。

D. he looked at me with an air of surprised disapproval , as a colonel might look at a private whose bootlaces were undone .

他带着一种吃惊的，不满的神情看着我，好像一位上校看着一名没有系好鞋带的列兵一样。