1·The mailboat arrived on Friday mornings unless bad weather intervened.
除非受到恶劣天气的干扰，邮船于星期五上午到达。
—— 《柯林斯英汉双解大词典》
2·The South African mailboat arrived on Friday mornings unless bad weather intervened.
除非受恶劣天气干扰，南非邮船一般在星期五上午抵达。 。
1·The mailboat arrived on Friday mornings unless bad weather intervened.
除非受到恶劣天气的干扰，邮船于星期五上午到达。
—— 《柯林斯英汉双解大词典》
2·The South African mailboat arrived on Friday mornings unless bad weather intervened.
除非受恶劣天气干扰，南非邮船一般在星期五上午抵达。 。