Fractograph
断口组织(金属断面)的显微镜照片
🗣️ 情景例句
Salad dressing?
沙拉要什么调味酱？
No practice, no gain in one's wit.
吃一堑，长一智。
We owe a lot to the birds and beasts who eat insects but all of them put together kill only a fraction of the number destroyed by spiders.
我们要十分感谢那些吃昆虫的鸟和兽，然而把它们所杀死的昆虫全部加在一起也只相当于蜘蛛所消灭的一小部分。