Arctan
反正切
🗣️ 情景例句
Which advertisement company did you serve?
你在哪家广告公司做事？
Barking dogs seldom bite.
善吠的狗很少咬人。
Gifts poured in not only from unknown people, but room baby food and soap manufacturers who wished to advertise their products.
不但素昧平生的人寄来了大量的礼物，而且婴儿食品、婴儿肥皂制造厂商为了替自己产品做广告也寄来了大量的礼物。