Definition: the reason why something, especially something bad, happens Level: B2
团队正在调查爆炸的原因。
The team is investigating the ___cause of the explosion.
医生说是由于自然原因。
The doctor said it was due to natural ___causes.
不良饮食可能是肥胖的原因。
Poor diet can be a ___cause of obesity.
