老师布置家庭作业时，学生们通常感觉做作业是一种义务。

When teachers assign homework, students usually feel an obligation to do it.

《柯林斯英汉双解大词典》

如果你希望建立一种新的关系，开始时就要小心缓慢行事。

If you are hoping to form a new relationship tread carefully and slowly to begin with.

《柯林斯英汉双解大词典》

在他回忆早年的家族企业时，他的声音里带有一种确定无疑的怀旧语气。

There is an unmistakable note of nostalgia in his voice when he looks back on the early years of the family business.

《柯林斯英汉双解大词典》

An entry is made in the memo whenever an item, memo and an available size pair is considered.

每当选择一件物品和考虑，一种可行的方案时，都会访问。

麻省理工公开课 - 计算机科学及编程导论课程节选

And there was an idea that we exercised with the phonebook which was this notion of dividing and conquering.

我们在进行电话簿实验时用到了一种思想,它就是划分和征服。

哈佛公开课 - 计算机科学课程节选

This is a signal - this passing of phosphorous - is a signal that's used very frequently in intracellular communication.

这是一种信号,一种通过磷酸来传递的信号,这种信号在细胞内通讯时经常被用到

耶鲁公开课 - 生物医学工程探索课程节选