Firstly, ambition plays an essential role because it serves as a driving force for people to achieve success.

首先，志向起着至关重要的作用，因为它是人们取得成功的动力源泉。

youdao

Firstly, food is often thrown away before it reaches customers because too much of it is produced.

首先，食物经常在到达顾客之前就被扔掉，因为生产的食物太多了。

youdao

Firstly, many truck drivers are forced to drive days and nights with little rest simply because their employers desire more profit.

首先，很多卡车驾驶员被迫日夜不停地驾驶，因为他们的雇主想赚更多的利润。 第二，许多市民在酒后驾驶，一旦发生紧急情况他们的反应会比较迟缓。

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Firstly, because the judge in Bangladesh was prepared to go public and emphasise the "civil wrong" which had been done against her client, and secondly, because a British High Court order served under the new Forced Marriage Act was mentioned at the Dhaka hearing.

BBC: The fight against forced marriage

He said the reasons were firstly practical, because for example if a person's entitlement to vote was based on Scotland being their birthplace a whole new electoral register would be needed.

BBC: Member's debate: Independence referendum

Firstly, there is a tiny extra risk of complications because of the general anaesthetic.

BBC: Heart bypass - with local anaesthetic