Hard-shelled
a. 有硬壳的, 僵硬的
🧩 词语组成解析
hard
[hɑrd]
adj. 困难的;硬的;有力的;努力的;
adv. 努力地;猛力地;严重地;沉重地;
n. 英〉硬海滩，登陆处;
a. 带壳的；去壳的
🗣️ 情景例句
No problem.
小事一桩。
I'm playing ping-pong downstairs.
我在楼下打乒乓球。
Some of the bigger firms are engaged in researches which are of such general and fundamental nature that it is a positive advantage to them not to keep them secret.
某些大公司进行的研究属于一般和基础性的研究。因此不保密对他们才有利。