answer
加入词篮respond
reply
response
key
problem
puzzle
bewilder
difficult
difficulty
strenuous
solve
solution
soluble
resolve
dissolve
saw
quote
extract
excerpt
handwriting
practice
practise
notebook
revise
review
professor
maths
mathematical
arithmetic
add
addition
plus
and
subtract
minus
multiply
multiple
triple
twice
divide
division
remainder
difference
value
function
variable
number
innumerable
decimal
reciprocal
inverse
negative
fraction
vulgar
percent
percentage
equal
equation
formula
formulate
equality
equivalent
namely
odd
even
geometry
line
linear
ray
straight
erect
parallel
extend
extension
vertical
intersection
triangle
angle
circle
radius
diameter
round
loop
circular
circuit
circulate
dot
compass
sector
solid
cube
cylinder
sphere
square
rectangle
oval
spiral
streamline
