JECT
JECT comes from jacere, the Latin verb meaning "throw" or "hurl".如reject, eject, inject
interject: 刚刚看一位是互相throw，看了解释才知道不是这样的，主要是用来表示打断对话，不过是善意的，并不会打断思路。
conjecture: to guess
projection
trajectory
TRACT
TRACT comes from trahere, the Latin verb meaning "drag or draw".
traction
retract: re词根
protract
intractable
