
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
In the Cartesian coordinate system $xOy$, the parametric equation of line $l$ is $\begin{cases} x=2+ \frac {1}{2}t \\ y= \frac { \sqrt {3}}{2}t \end{cases}$ (where $t$ is the parameter). If the origin $O$ of this Cartesian coordinate system is taken as the pole and the positive half-axis of $x$ as the polar axis to establish a polar coordinate system, the polar equation of curve $C$ is $\rho\sin ^{2}\theta-4\cos \theta=0$.  
$(1)$ Find the standard equations of line $l$ and curve $C$;  
$(2)$ It is known that line $l$ intersects curve $C$ at points $A$ and $B$. Let $M(2,0)$, calculate the value of $| \frac {1}{|MA|}- \frac {1}{|MB|}|$.

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