交互型CAD系统得频繁的分配与释放内存。

Interactive CAD systems have to allocate and deallocate memory frequently.

youdao

这么说，您是要知道升级您目前的系统得花多少钱，是这样吗？

So, you would like to know how much it would cost to upgrade your current system, is that correct?

youdao

本市的大多数通勤者也都这么认为，因为作为交通方式的一部分的地铁系统得追溯到19世纪60年代了。

With an underground train system in part dating back to the 1860s, most of the city's commuters would agree.

youdao

So, that's a homogeneous system, one phase. You have to know if your system is an equilibrium system or not.

所以这是个均匀系统，只有一个相，你得知道你的系统,是不是个平衡系统。

麻省理工公开课 - 热力学与动力学课程节选

You have to have a good public transportation system when you have as many people here as we do.

如果你那儿和我们这儿的人一样多，你们得有一个良好的公共交通系统。

纽约的交通手段 - SpeakingMax英语口语达人

You have to inject it multiple times because the first blip that you get in immune response is not very high, you have to boost and often you have to boost again in order to get a high enough response to be protected.

你必须得进行多次注射,因为第一次注射,无法使免疫系统产生强烈反应,你得要增强免疫,通常还得再增强一次,以使反应足够强烈,从而起到保护作用

耶鲁公开课 - 生物医学工程探索课程节选