长期试验

after a long time

Long Chicken

long-drawn-out project (a project which takes so long that young workersbecome bearded)

early long-grain nonglutinous rice【粮食】

long-range rate of appreciation method

long shunt compound winding【电】

long-range business【经管】;long-standing business dealings【经管】

long-range planning【计划】;long-term plan【计划】