当然在欣慰之余，我清醒地知道再好的书，要成为读者喜爱的热销图书，也必须要做好广告宣传。

Of course, when gratified, I do understand that advertising and sales promotion is definitely needed for even a very good book to be favorite reading of readers.

youdao

因此，必须要对种鸡进行有效的免疫，以避免这种破坏性极大的疾病的继续恶化，同时，其他针对商品肉鸡的防控措施也必须要做好。

So, whilst effective vaccination of breeders is highly desirable in preventing the more obviously devastating disease, other approaches must be considered for broilers on the ground.

youdao

1941年的夏天，外婆生病了必须要做手术，因此我的生日也几乎没有怎么庆祝。

In the summer of 1941 Grandma got sick and had to have an operation, so my birthday passed with little celebration.

youdao

We make software; we make technology; we're innovative ,but so are they So, what we really have to do is become a lot more productive and we have to make our companies a lot more competitive. Today, I feel we're losing that edge.

我们生产软件；发展工业技术;,我们有创新能力，但他们也有,所以，我们现在必须要做的就是提高生产效率,我们必须提高我国公司的竞争力,现在，我觉得在这方面我们正在丧失竞争优势。

耶鲁公开课 - 金融市场课程节选

because you have to do... like, you learn a lot of stuff by doing that too,

因为你必须……做那个你也要学很多东西。

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