在这种情况是相长干涉还是相消干涉？
In this case is it constructive or destructive interference?
这种情形称作相消干涉。
如果我们减去干涉项，我们得到的就是相消干涉。
So if we're subtracting the interference term, what we have here now is destructive interference.
这里是相消干涉。
好了，我们看到的是相长干涉，当然我们也会看到相消干涉。
All right. So we see constructive interference, of course, we can also see destructive interference.
如果你们比较s轨道和下面这叶，它们正负号相反，所以它们相消干涉。
If you compare the s orbital with the bottom lobe, these have a different sign so they're going to destructively interfere.
就像我们看到水波，和光波的相消干涉，我们也可以看到轨道的相消干涉。
Just like we see destructive interference with water waves or with light waves, we can also see destructive interference with orbitals.
相反，如果我们是相消干涉，我们会形成sigma2s星，星代表什么？
In contrast, if we have destructive interference, what we're going to form is a sigma 2 s star, and what does the star designate?
我们知道电磁诱导透明(简称EIT)是原子相干对光吸收的相消干涉所致。
IT is well known that Electromagnetically Induced Transparency (EIT) occurs because of the absorption cancellation by atomic coherence and interference.
现实中的信号由各种频率的正弦波组成，因此，在有限的波长数后，它们会干涉相消，你就得到一个有限宽度和有限延续的信号。
Realistic signals are made by summing sine waves of lots of frequencies, so that after some finite number of wavelengths they interfere destructively and you get a signal of finite width and duration.
此类超高场强MRI带来了许多可预见的优势，然而技术上的难题也随之产生，例如在一些特殊的线圈中RF发射场会产生相消性干涉现象。
But besides the many potential advantages of ultra-high field MRI, there are also some methodological challenges like the destructive interference of transmit RF fields within typical volume coil.
此类超高场强MRI带来了许多可预见的优势，然而技术上的难题也随之产生，例如在一些特殊的线圈中RF发射场会产生相消性干涉现象。
But besides the many potential advantages of ultra-high field MRI, there are also some methodological challenges like the destructive interference of transmit RF fields within typical volume coil.
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