In theory, any food can cause an allergy.
理论上，任何食物都会引起过敏。
There is a controversial theory that transfusions can cause decreases in immune function.
有一争议性的理论认为输血会导致免疫系统功能减弱。
The root cause for such contradictions is the isolation between theory and practice.
这些矛盾的根源是理论与实际的脱节。
Many people hold to the theory that smoking is a cause of cancer.
许多人坚持吸烟致癌的看法。
Many people hold to the theory that smoking is a cause of cancer.
许多人坚持吸烟致癌的看法。
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