1. [由此及彼]根据已知单词的词义推断出其同根词的词义。
① resident n.居民→nonresident n.
② residence n.居住→noresidence n.
2. [同义相连]以下是以resid-为词干的单词，其基本含义是“剩余”，“残留”。可借助词典完成本题。
① resid a.剩余的；残留的
② residue b.残留物；社会底层
③ residual c.残油；渣油
④ residuary d.剩余的；接受剩余财产的
⑤ residuum e.残余；余数；剩余财产
3. [寻根问底]指出下列单词的词根并领会其词义的由来。
① obsess v.迷住；缠住
obsession n.着迷；缠住
② sessile a.固着的；座生的；无柄的
③ subsidy n.助学金；津贴
subsidiary a.辅助的；补助的
subsidize v.给……补助；资助
④ residentiary n. [宗教]驻在牧师；居住者
4. [节外生枝] sid有个异形根sed来自sidere的异体sedere。以下是主要的派生词。
① sediment n.沉淀；沉积
sedimentary a.沉淀性的；沉积的
② sedan n.轿子；轿车
③ sedentary a.坐着的；（鸟等）定居的
④ sedate a.安静的 v.给……服镇静药
sedation n.镇静
sedative a.镇静的；止痛的 n.镇静剂；止痛药
85. sign [L]=mark记号
常用词sign，signal，signature和signify中含有一个常用的拉丁词根sign，它来自拉丁名词signum或拉丁动词signare的词干部分，意思为mark（记号）或to mark（加记号）。
sign [sign=mark, or to mark（加）记号→]Ⅰn.① mark or symbol符号；记号：mathematical signs数学符号② indication标志，标记：Black is a sign of mourning.黑色是哀悼的标志。③ gesture示意动作：signlanguage手语Ⅱv.① write (one's signature) on签（名），署（名）：to sign a document签发文件② communicate by a sign以动作示意：He signed his disapproval by frowning.他皱眉表示不同意。
▽signable [sign v.;-able a.] a.可签名的
signless [sign n.;-less a.] a.不表示的；无符号的
signal [sign=to mark记号；-al n.=the result表行为结果→“the result of marking做记号的结果”→]Ⅰn. anything that serves to indicate信号，暗号：traffic signals交通信号→Ⅱa.① serving as a signal用作信号的：a signal light信号灯② unusual;outstanding非凡的；突出的：a signal accomplishment非凡的成就→III v. make a signal to向……发信号：Sailors signal with flags by day and with lights at night.水手们白天用旗，晚上用灯发信号。
▽signalize [signal;-ize v.] v.使突出；表明；向……发信号
signify [sign=mark记号；-ify v.=to make使→“to make something a sign使某物成为标记”→] v.① be a sign of;have the meaning of表明；意味：The clouds signified the coming storm.乌云意味着暴风即将来临。② be of importance;matter有重要性；要紧：What a fool says does not signify.傻瓜之言，无关紧要。
▽signification [signif(y);-ication n.] n.正确意义；含义
significative [signif(y);-icative a.] a.有意义的；表明……的
signature [sign=to mark加记号；-ature n.=the result表行为结果→“the result of making one's mark on (sheep)在（羊身上）加上自己标记的结果”→] n.① personal mark本人的标记 ② one's name signed on a document署名，签字：to put one's signature to a letter在信上签名
▽signatureless [signature;-less a.] a.无署名的
signatory [sign;-atory n./a.] n.签署者 a.签署的
assign [as-(ad-)=to 向；sign = to mark 加记号→“to mark something to somebody向着某人对某事作出记号”→] v.① give out;allocate给予；分配：They assigned us a room. 他们分配一个房间给我们。② give out as task指派，布置：to assign homework to the class给班上学生布置作业
▽assignment [assign;-ment n.] n.（分派的）任务，作业
assignation [assign;-ation n.] n.分配；分派；指定；约会
consign [con-(com-)= together 共同；sign = to mark 作标记→“to mark together as an agreement 共作标记以示同意”→] v. ① transfer to another's custody把……委托给：to consign the boy to the care of his uncle把男孩托给叔叔照管② hand over or deliver托运，运送：to consign goods to the agents将货物运给代理商
▽consignment [consign;-ment n.] n.托付（物）；运送（物）
consignee [consign;-ee n.] n.受托人；收货人；收件人
design [de-=down下；sign=to mark做标记→“to mark down in detail详细地做下标记”→]Ⅰv.① prepare the plan for设计，构思：to design a new bridge设计新桥 ② develop and plan for a purpose谋划，预定：The scholarship is designed for foreign students.这项奖学金是为外国留学生设立的。Ⅱn. ① outline or drawing for something to be constructed 设计图，图纸：designs for the new building 新楼图纸② the way in which something is shaped or made设计：to study art and design学习艺术设计
▽designing [design;-ing a.] a.工于心计的；狡猾的
designable [design;-able a.] a.可设计的
resign [re-=undo取消；sign=to mark or seal加标识→“to undo that of sealing, or unseal取消标识或封印”→] v.① give up without resistance放弃，抛弃：He resigned himself to failure.他自甘失败。② give up an office or position辞职，引退：He resigned his seat in the Parliament.他辞去议院的议席。
▽resignation [resign;-ation n.] n.辞职；放弃
