1.reinforce v.加强(to strengthen);补充(to strengthen by additional assistance, material)

词根记忆：re（再）+inforce(强化)--加强

例：In birds, these hollow bones are reinforced more massively by internal struts.

2.reinvest v.再授给(to invest in additional securities);再投资(to invest again or anew)

词根记忆：re（再）+invest（投资）--再投资

例：The profits may be reinvested to increase economic growth through eco efficiency.

3.reject v.拒绝，抵制(to refuse)

词根记忆：re（反）+ject（扔）--被扔回来--拒绝

例：Recently a court ruled that current law allows companies to reject a job applicant if working in the job would entail a 90 percent chance that the applicant would suffer a heart attack.

同根词：object（v.反对；n．目标）

4.rejection v.抛弃：拒绝(the action of rejecting)；被抛弃的东西(sth．rejected)

词根记忆：来自rejecl（v.拒绝）

例：The first presents a goal that the argument rejects as ill-conceived ;the second is evidence that is presented as grounds for that rejection.

同根词：ejection（n．喷出；排出物）

5.rekindle v.重新激起(to cause Sth．to light again)

词根记忆：re（重新）+kindle（点燃）--重燃--重新激起

例：He is trying to rekindle pride in his compatriots．

6.rolative n.亲戚（a person connected with another by blood or affinity）；a．相对的：相关的(not absolute or independent)

词根记忆：来自relate（v.相关，关系）

例：Once introduced into southern Europe ,maize became popular with landowners because of b high yields relative to other Cereal Crops.

派生词：relatively（ad．相对地）

同根词：relation（n.关系）

7.relativity n.相对论(Einstein's theory of the universe which shows that all motion is relative and treats time as a fourth dimension related to space)

例：general relativity广义相对论

8.relay v.中继转发，转播(to broadcast sth. by passing signals through a transmitting station)

例：Robot satellites relay important communications and identify weather patterns.

9.release v./n.排放(to send out);发表（布）(to make available to the public)；解放，释放(to set free from restraint, confinement, or servitude)

词根记忆：re（一再）+lease(松弛，放松)--解放，释放

例：The release of the iron compounds did not increase the supply of nitrogen compounds in the area.