observe directly是一个英语单词，有几个不同的含义。 让我们用例句来解释每个的含义和用法！
But the thickness of the tiny thin film measures only several tens of nm, so it is difficult to
observe directly
and hard to determine exactly what phenomenon is occurring.
然而，很难在现场
直接观察
几十纳米的微观薄膜的偏振，以了解正在发生的具体现象。
However, it has been difficult to measure their size and mass accurately because they mainly consist of dark matter that we cannot
observe directly
.
但由于其主要成分是暗物质*2，
肉眼无法直接看到
，因此一直难以准确测量其大小和重量。
Protein structure determination | Protein Crystal Growth on the International Space Station: JAXA Protein molecules are too small to
observe directly
, so studying them is always accompanied by some difficulty.
蛋白质的结构分析 | 蛋白质晶体形成空间实验：Kibo 空间站公共关系和信息中心 – JAXA 蛋白质研究充满困难。这是因为蛋白质非常小，无法
直接观察
。
Contribution for the Field Museum Display of the real-time fish behavior that is difficult to
observe directly
can encourage interest of general citizen as well as fish researchers.
对实地博物馆概念的影响和贡献 通过实时展示亚马逊河中难以
直接看到
的鱼类行为，不仅可以引起研究人员的兴趣，还可以引起公众的兴趣。
Unveiling of the crystal-growth mechanism There are still many scientific issues to be solved concerning the crystal-growth mechanism for numerous reasons: difficult to
observe directly
atomic and molecular behavior during crystal growth and number of complex phenomena since convection influences heat and material transportation to the growth boundary face.
晶体生长机制的阐明晶体生长的机制仍然是一个未解决的科学问题。其原因是，
直接观察
晶体生长过程中原子和分子的行为是极其困难的，而且由于到生长界面的热量和质量传输受到对流的影响，这一现象变得复杂。我可以列出它。
Pulse radiolysis method requires short pulse of radiation typically from picoseconds to nanoseconds (10-9 s) otherwise fast phenomena cannot be observed.This method enables us to
observe directly
short-lived reactive species such as radicals (species having unpaired electron(s)) and excited states produced by ionizing radiations.
脉冲辐射分解法是用几皮秒到几纳秒（10-9秒=十亿分之一秒）的短脉冲辐射瞬时照射
样品
，产生自由基（含有不成对电子的化学物质）。使用时间分辨紫外-可见吸收光谱法生成活性物质，例如以及随后的反应行为。
Thus astronomers study them to learn about the beginning of the planet formation process.Edgeworth-Kuiper Belt Objects with radii from 1 kilometer to several kilometers have been predicted to exist, but they are too distant, small, and dim for even world-leading telescopes, like the Subaru Telescope, to
observe directly
.
海王星是太阳系中距离太阳最远的行星，在海王星之外，存在着一些半径在1公里到10公里左右的小天体，这些小天体是在成长为行星的过程中留下的，是用来创造行星的物质。正如地球一样，据预测今天仍然存在。然而，这种大小的小天体是如此微弱，以至于无法使用斯巴鲁望远镜等大型望远镜
直接观察到它
。
听听“ observe directly ”的土声（发音）！
读法是【əbˈzərv dɪˈrɛkli】。 听下面的视频并大声发音【əbˈzərv dɪˈrɛkli】。