Unit6

1. val 强壮

valid
invalid
validate
invalidate

prevail

prevailing
prevalent

2. pri 主要的

prime
Prime Minister
premier

primary
primary school

prior
prior to sth
prioritize

priority
principle

principal
prince
princess

3. nov 新

news
newspaper
newsroom
headline
cover story

renew
renewable

novel
novelty

innovation

innovative
innovate

4. initi 初始

initial
initially
initialize
initialization

initiate

initiative

5. strain，string 拉紧

string
a string of
pull the strings

stringent

strain

constrain
constraint

restrain
restraint

restrict
restriction

6. mend 修正

mend

amendment
the Fifth Amendment

commend

recommend
recommendation

7. duc，duct 引导；带来

introduce
introduction

conduct
conductor
misconduct

deduct
deduction
deductible

induce

seduce

produce
product
reproduce
reproduction
reproducibility

productive
productivity

reduce
reduce A to B
be reduced to
reduction
energy conservation and emission reduction

8. 落单词

fashion
fashionable

otherwise
likewise

label
tag
brand