it is customary for the new arrival to be placed between the stalls of two captives whose training is already well advanced.
通常是把新到的安置在两头训练得很好的大象的象厩中间，
新概念英语第四册
Lesson 41 Training elephants
📚 句中词汇解析
从本句中提取的重要词汇
adj. 习惯的;通常的;照惯例的;
n. 习惯法;风俗志;
💡 custom= habit习惯+ary...的 →习惯性的
"He makes his customary visit every week."
他每星期都按照惯例造访一次.
近义：traditional, typical, conventional, inevitable, assiduous, normal
n. 到达，抵达;出现，登场;新生婴儿;到达者;
💡 arriv=arrive到达+al表示人 →到达者
"Shortly after my arrival at the school, I was befriended by an older girl."
我到学校后不久便得到了一位年龄较大的女孩友善对待。
近义：appearance, appearing, imminence, approach, approaching, assistance
反义：parting, withdrawment, departure, egress, exit, exodus
adj. 先进的;高等的，高深的;年老的;晚期的;
v. 前进(advance的过去式和过去分词);增加;上涨;
💡 advanc前进+ed...的→ 先进的，高级的
"There were only three of us on the advanced course."
只有我们三人学高级课程。
近义：progressive, civilized, developed, forward, anticipated, late
反义：posterior, subsequent, succeeding, ulterior, farther, following
n. 训练;培养;（枪炮，摄影机等的）瞄准;整枝法;
v. 训练，培养( train的现在分词);教育;瞄准;整枝;
"training for non-professional staff"
对非专业员工的培训
近义：learning, preparation, taming, capacitation, coaching, habilitation
adv. 早已，已经;先前;
💡 all(所有)+ready(准备):所有都准备好了- 已经
"He was already aboard the plane."
他已经登机了。