It has been found that certain bats emit squeaks and by receiving the echoes,
人们发现，某些蝙蝠能发出尖叫声，
新概念英语第四册
Lesson 7 Bats
📚 句中词汇解析
从本句中提取的重要词汇
vt. 创办，成立，建立;
v. 发现（ find的过去式）;找到;到达;发觉;
💡 found基础 → 为(房屋等)打基础，建立，创立
"In some stories, genies are always found inside a lamp or bottle."
在一些故事里, 灯里或瓶子中总是装有妖怪.
近义：base, ground, establish, institute, mount, rest
反义：invalidate, abrogate, negate, nullify, omit, outlaw
adj. 某一;必然的;已确定的;
pron. [动词用复数]某些;
"Federal courts have a certain cachet which state courts lack."
联邦法院有某种州法院所缺乏的特别的东西.
近义：some, inarguable, indisputable, indubitable, invariable, irrefragable
反义：neither, implausible, improbable, uncertain, unlikely, avoidable
vt. 发出;发射;颁布;发表;
💡 向外(e字根)送出去(mit字根)- 发射
"The metal container began to emit a clicking sound."
金属容器开始发出咔嗒咔嗒的声音。
近义：issue, radiate, release, shed, spring, beam
反义：sip, soak, sop, sponge, suck, sup
receiving
[ri'si:viŋ]
n. 接受;收款，收货;
adj. 接受的;
v. 收到( receive的现在分词 );接到;接纳;接待;
"He is receiving treatment for shock."
他正在接受休克治疗。
近义：recipient, collector