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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。 。

邮船

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。 。