"用移液器吸取" can be translated as "pipette (out)" or "aspirate with a pipette" in English.
"Pipette (out)" is a more concise expression, often used in laboratory contexts to describe the action of using a pipette to draw up or transfer a liquid.
"Aspirate with a pipette" provides a more detailed description, emphasizing the use of a pipette for the aspiration (drawing in) process.
In most laboratory instructions or reports, "pipette (out)" would be sufficient and commonly understood. For example:
Pipette out 2 mL of the solution. （用移液器吸取2毫升溶液。）