「主因」

(pos:名詞)
<explanation>
yue:#主要#原因（量詞：個）
eng:main cause; principal factor
<eg>
yue:水浸嘅主因係渠道淤塞。 (seoi2 zam3 ge3 zyu2 jan1 hai6 keoi4 dou6 jyu1 sak1.)
eng:The main cause of flooding is silting of channels and ditches.