环保灯对地球来说是好的，而且它很省钱、方便，因为它不需要每隔几个月就更换一次。
The eco-light is good for earth, and it's cost-effective and convenient, because it doesn't have to be changed every few months.
上个周末我在丹佛用了最后一次右呼吸鼻带，所以今天我买了更多，因为我有很多的优惠券。
I used my last Breathe Right nasal strip in Denver last weekend, so I bought more today because I had a coupon.
她真的很伤心，但是凯文说他只是想最后一次约会来确定他是否真的爱她，因为他想让她和他结婚。
She was really hurt, but Kevin said he just wanted one last date to be sure that he was in love because he wanted to ask her to marry him.
我的父母很担心我，因为那是我第一次独自住在国外。
My parents were very anxious about me, because it was the first time that I had lived abroad alone.
我非常开心，因为那是我第一次得到我父亲对我工作的赞赏。
I was so happy because that was the first time I gained recognition for my work from my father.
医务人员透露，这不是她第一次因为吃了这些餐具而接受治疗。
Medics revealed it was not the first time that she had been treated for eating the cutlery.
组织方决定邀请该集团的主席约翰尼再来做一次演讲，因为他之前的演讲非常受欢迎。
The organizer decided to invite Johnny, the president of the group, to deliver a third speech as his previous ones were so well received.
然后，我到达办公室时，我不得不按了五次对讲机，因为我听不到任何回应。
Then, when I reached the office, I had to ring the intercom five times as I couldn't hear a response.
当它们睡觉的时候，它们很少躺下来一次睡上几分钟，因为它们很难再起来，在野外这是很危险的。
When they sleep, they seldom lie down and sleep for minutes at a time, since it's difficult for them to get up again and it's dangerous in the wild.
她在这儿停了下来，又吃了一次早饭，吃得很痛快——不是在Sow-and-Acorn客栈，因为她要避开客栈，而是在教堂旁边的一家农舍里。
She made a halt here, and breakfasted a second time, heartily enough—not at the Sow-and-Acorn, for she avoided inns, but at a cottage by the church.
他知道如果他捡起普通的石子再扔下去，因为它们是冷的，他可能会捡起同样的石子几百次。
He knew that if he picked up normal pebbles and threw them down again because they were cold, he might pick up the same pebbles hundreds of times.
既然我们一次只走一步，就没有必要计划我们的路线，因为一个人可以不断地决定下一步去哪里。
Since we only take one step at a time, there is no need to plan our route for one can make continuous decisions about where to turn next.
在每一次物种大灭绝后，都有一次突然的进化爆发，因为会有新物种出现来填补灭绝创造的生态位。
Following each mass extinction, there is a sudden evolutionary burst as new species develop to fill the ecological niches opened by the event.
这个无名人士让人类的发展跨出了历史性的一步，因为正是在那一年，人类在其历史上第一次成为主要的城市物种。
This nameless person pushed the human race over a historic threshold, for it was in that year that mankind became, for the first time in its history, a predominantly urban species.
许多人将会记住鲍勃•马利，因为正是他让他们第一次体验雷盖音乐。
Many people will remember Bob Marley for giving them their first taste of reggae music.
还没发现这个结论，因为它取决于这次一次性研究的结果。
This conclusion is unfounded because it depends on the results of a one-shot study.
因为一个人的膳食中少量的脂肪是必要的，你可以在你准备的任何一盘菜中保留一个蛋黄，每周若干次。
Since a small amount of fat is needed in one's diet, you can retain one yolk in any dish you're preparing a couple of times per week.
最糟糕的是，第一次作弊没有被抓住的作弊者通常会再次作弊，不仅因为其成绩更加落后，还因为作弊似乎“更容易”。
Worst of all, a cheater who doesn't get caught the first time usually cheats again, not only because he/she is farther behind, but also because it seems "easier".
彼得·帕克只有一次穿上蜘蛛盔甲，可能是因为它太重了！
The Spider Armor was donned by Peter Parker on only one occasion, probably because it was too heavy!
有一次我对他很严厉，因为他不愿意爬超过几米的绳子。
I was hard on him once because he wouldn't climb more than a couple of metres up the rope.
他很沮丧，因为他刚刚失去一次价值2000美元的玻璃制品的买卖。
He was frustrated because he just lost a sale of a piece of glass for $2000.
这场比赛以平淡的1-1打平结束，如果不是因为这是我第一次去纪念碑球场，我可能已经忘记了。
The game ended in a tame 1-1 draw that probably would have slipped from the memory had it not been my first visit to the Monumental.
她仍然记得第一次因为高昂的价格而不交作业的痛苦感受。
She still remembers the sting of her first experience skipping an assignment due to the high prices.
他也被认为是一个伟大的爱国者，不仅因为他的卡通赞扬美国，而且，在第二次世界大战期间，他的工作室为美国士兵制作训练电影。
He was also regarded as a great patriot because not only did his cartoons praise America, but, during World War II, his studios made training films for American soldiers.
当孩子们第一次上学的时候，父母们常常会感到兴奋和些许悲伤，因为这是一个成长阶段的结束。
When children start school for the very first time, parents often feel a sense of excitement coupled with a touch of sadness at the end of an era.
这项裁决对于在许多州都有业务的大型连锁店来说是一次胜利，因为他们已经对网上购物征收销售税了。
The ruling is a victory for big chains with a presence in many states, since they usually collect sales tax on online purchases already.
那天早上，我又把头探进阁楼里，这一次我几乎尖叫出来…并不是因为我看见了什么，而是因为我什么都没有看见。
That morning, I once again stuck my head into the attic, and this time I almost screamed…Not from what I saw, but from what I did not see.
他这样做的时间不会太长，因为幸运的是，公众有良好的判断力，不会不止一次地购买劣质商品。
He will not do so for long, for mercifully the public has the good sense not to buy the inferior article more than once.
因为这个城市以前举办了两次奥运会，在最后一次举办100年之后它将再一次举办这个盛会。
As the city that has hosted two Olympics before, it will host the event 100 years after its last Games.
我真的很幸运，因为这是我第一次参加比赛。
I was really lucky because it was the first time I had taken part in any competition.
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