Walkers
n. 步行者（walker的复数）
🗣️ 情景例句
she's still alone, without her family.
她仍是孤单单的，找不到家。
I look forward to receiving your reply.
我期待着你的答复。
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。