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1.resent v.怨恨，恼火（to feel or express ill will or annoyance at）
词根记忆：re(反)+sent(感情)--反感--恼火
例：The hard-sell(强行推销)approach may make some consumers resent being told what to believe.
派生词：resentment(n.怨恨，愤恨)；resentful(a.愤慨的，忿恨的)
同根词：sentiment(n．情感)
2.reservation n.预订;保存(an act of reserving sth.)；自然保护区(an area in which hunting is not permitted)
词根记忆：来自reserve(v.储存，保存：预订)
例：It failed to mention water rights to be enjoyed by the reservation's inhabitants.
同根词：preservation(n．保存)
3.reserve n.储备(sth. reserved or set aside for a particular purpose, use, or reason);v.保留；储备(to keep)
词根记忆：re+serve(服务，保持)--保持--储备；保留
例：Federal Reserve（美国）联邦储备署//The government intended to reserve water as well as land when establishing the reservation.
派生词：reservation(n．保留)
4.reservoir n.水库；蓄水池(an artificial lake or an apparatus where water is collected and kept in quantity for use)
词根记忆：来自reserve(v.保存，储备)
例：The city council planned to build a reservoir along the river.
5.reside v.居住(to dwell)；存在(to present)
词根记忆：re+side(坐)--坐落--存在
例：Some homeless people reside in group living quarters.
派生词：residence(n.住处；居住)；residential(a．居住的：寄宿的)
6.residency n.住宅，住所(any address at which you dwell more than temporarily);住院医生实习期(the period of time when a doctor working in a hospital receives special advanced training)
词根记忆：来自resident(n.居民)
例：The Immigration Service now has the discretionary power to keep families united even though not all their members meet the five-year residency requirement.
7.residential a．住宅的，与居住有关的(of or relating to residence)
词根记忆：来自resident(n．居民)
例：Vehicle traffic in most residential // areas of Arumville is heavier today than it was twenty years ago.
8.residual a.残余的，剩余的( of, relating to, or constituting a residue)
联想记忆：re+sid(放置)+ual--不能放回去的--残余的，剩余的
例：This incineration generated a large quantity of residual ash.
同根词：residuum(n．残留物：残余)
9.residue n．剩余物：残余(remnant, remainder)
联想记忆：re+sid(放置)+ue --不能放回去--残余
例：Ash residue from some types of trash can be used to condition garden soil.
n. 水库，蓄水池，积蓄，储藏
