词汇	oil and natural gas
释义	oil and natural gas 石油和天然气
随便看	problem specification problem specification laguage problem specification language problem-specification language problem-specific data base problem speech problems presented problems pressing for solution problems probably confronting a freshman problems proposed problems remain in terms of problems respecting problems revealed Problems,Social problems solving problems specific to the aged problem state problem state bit problem statement problem statement analizer problem statement analyser problem statement analyzer problem statement analyzer, PSA problem statement dialogue problem statement language