据我揣测他已经离开大连了的英文

my guess is that he's already left dalian

• 据:    occupy; seize
• 我:    I; my; me
• 揣测:    guess; conjecture; ...
• 他:    he
• 已经:    already
• 离开:    leave; depart from ...
• 了:    finish; complete; ...