那一定是天使 There must be an angel
春天一定会来 The Spring Will Come
约定的那一天 Precious days
那一天一定会到来 That day shall come
而这一天一定会开始的 and the day must begin
注定的一天 Unsuspecting Sunday Afternoon
命中注定的一天 Another day to destiny
固定一天 the fixed day
就厘定另一天 just fix another day
定天一
Unity of Heaven
以上为机器翻译结果，长、整句建议使用 人工翻译 。
你放心，他星期天一定来参加。
You can depend on his coming in on Sunday.
《牛津词典》
他今天一定过得很成功，因为他肩上扛着一个很大的包袱。
He had had a most successful day, for he carried an enormous bundle on his shoulder.
youdao
你这些天一定很忙。
You must be very busy these days.
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