他们和往常一样在晚上9点50分准时出现。They appeared on the dot of 9.50 pm as always.这则广告只能在晚上9点成人节目开始后才能播出。The advert should only be shown after the 9pm watershed.真的，我只在晚上抽烟。Seriously, I only smoke in the evenings....

“在晚上”的英语可以翻译为：at night，evenings ，in the evening...