or else是否则,要不然的意思.You have to roll the clothes very tightly or else they won't all fit in the rucksack.你得把衣服裹紧,要不然没法全都塞进帆布包里.放在句末有威胁的意思you'd better be there, or else.你最好过去,否则有你好受的.
要不然在英文中翻译的话，是有or和otherwise两个否则,要不然Hurry up, or you'll be late. 快点,否则你会迟到的。 否则,不然I'm not feeling very well today -- otherwise I would do it myself. 今天我身体不太舒服,否则这事我就亲自去做了。
你问的是英文吗？ 如果是的话那就应该是otherwise，作为一句话的转折。比如“You will have to pass the security check, otherwise you will not be able to get on the plane." 你必须通过安检，要不然你就上不了飞机
魔女在彼岸
