中英释义：
原声例句
但是只有植物细胞有细胞壁，当中坚硬的纤维素给植物制造了他的结构。
Only plant cells have a cell wall, which is made of rigid cellulose that gives the plant structure.
《TED教育》《TED-Ed》
之后，大自然就发了怒。多亏了芝加哥周边坚硬的岩石，我们才能躲过可怕的海啸和地震。
After that, nature took over. There's bedrock around Chicago, so we were spared the worst of the waves and the quakes.
《遗落战境》《Oblivion》
如果她从一个很高的地方落下来，而你却在她离地面仅有几英尺的时候才接住她，那么，你也无能为力了，除非你能神奇的将坚硬的路面变成棉花糖让她能有足够的时间慢慢停下来。
If she's falling from a high place, and you can't get to her until she's only a few feet above the ground, there's really nothing you can do other than magically turn the pavement into marsh-mellow to allow her enough time to slowly come to a stop.
《TED教育》《TED-Ed》