trim in Chinese

Slender, lean.

(uncountable, aviation, of, an aircraft) The state of adjustment of control surfaces such that the desired attitude can be maintained without requiring the continuous application of force to the cockpit controls.

(nautical) The fore-and-aft angle of the vessel to the water, with reference to the cargo and ballast; the manner in which a vessel floats on the water, whether on an even keel or down by the head or stern.