1.
The author verified that the first year of King Yi of the West Zhou was 899 BC based on the eclipse hypothesis of Double Dawn.
作者由“天再旦”日食说证实西周懿王元年为公元前 899年。
2.
A monk reaches the point of no return on the day he makes his vows.
一旦哪天削发为僧，和尚就不能再还俗了。
3.
Once they have a few more days of recovery to allow for adaptation, we do it again.
一旦他们有几天的时间去恢复以适应新的状况，我们将再次进行相同的训练。
4.
New Year' s Eve is the day before 1 January.
除夕是元旦的前一天。
5.
Since New Year's Day, the weather had been beautiful and clear.
元旦起，是大好的晴天。
6.
A parade was held on New Year's Day.
元旦那天举行了游行。
7.
I wish I could fly to the sky.
旦愿我能够飞到天上去，
8.
Once started there is no going back.
一旦开始之后，就再也没有退路了。
9.
Once time has gone by, it will never return.
时间一旦消逝，就永不再回来了。
10.
It is impossibls to rehydrate a mucus globule once it has become dehyrated.
一旦已经脱水，粘液不可能再水化。
11.
As portions of the cell plate are completed, the microtubules again depolymerize.
一旦细胞极安置完成，微管又再行解聚。
12.
As soon as there is anything definite, I'll let you know.
一旦有了什么具体的成绩，我再告诉你。
13.
Once people retire they automatically cease to be union members.
人们一旦退休就自动不再是工会会员。
14.
Thought once awakened does not again slumber .
思想一旦被唤醒，就再也不会沉睡。
15.
When once his mind is made up there is no changing it.
他一旦下了决心，就再也不会改变。
16.
The archangel cast from heaven for leading the revolt of the angels; Satan.
撒旦由于领导众天使造反而被从天堂打下的，撒旦
17.
Human fortunes are unpredictable as the weather
天有不测风云人有旦夕祸福
18.
You cannot secure yourself against all risks and dangers.
人有旦夕祸福,天有不测风云。