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perturbative expansion (physics)

surname Wei / ancient Chinese state near present day Chongqing / Taiwan pr. [Wei2]

tiny / miniature / slightly / profound / abtruse / to decline / one millionth part of / micro- / Taiwan pr. [wei2]

infinitesimal disturbance / perturbation (physics)

to disturb

surname Zhan

to spread out / to open up / to exhibit / to put into effect / to postpone / to prolong / exhibition

to unfold / to carry out / to be in full swing / to launch

to open / to start / to turn on / to boil / to write out (a prescription, check, invoice etc) / to operate (a vehicle) / carat (gold) / abbr. for Kelvin, 開爾文|开尔文[Kai1 er3 wen2] / abbr. for 開本|开本[kai1 ben3], book format