Defenselessness
n. 无防御
✅ 同义词
🗣️ 情景例句
Yor're quite right.
您说得对。
If there's anything else I can do, please call on me.
如果有任何事情我能效劳的话，请打电话给我。
and we have only to turn to that extraordinary discovery of echo-location in bats to see a case in which the voice plays a strictly utilitarian role.
我们只要看一看蝙蝠回声定位这一极不寻常的发现，就可以探究一下声音在什么情况下有绝对的实用价值。