
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
Given an ellipse $M$ with its center at the origin of coordinates and its foci on the $x$-axis. If a vertex of $M$ is exactly the focus of the parabola $y^{2}=8x$, and the eccentricity of $M$ is $e= \dfrac {1}{2}$. A line $l$ (not perpendicular to the coordinate axes) passing through the right focus $F$ of $M$ intersects $M$ at points $A$ and $B$.  
$(1)$ Find the standard equation of the ellipse $M$;  
$(2)$ Let point $N(t,0)$ be a moving point, and $( \overrightarrow{NA}+ \overrightarrow{NB})\perp \overrightarrow{AB}$, find the range of the real number $t$.

Present the answer in LaTex format: \boxed{Your answer}
user