On Earth, among the surest indications of sunspot cycles are believed to be the rate that trees grow, as seen in the rings visible in the cross sections of their trunks.

在地球上，人们认为，表明太阳黑子周期最可靠的迹象之一是树木的生长速度，就像树干横截面上可见的年轮一样。

All cross sections are glued on and ready to plank.

所有截面胶合板上，并准备木板。

These options control cross sections and their arrows!

这些选项控制横截面和它们的箭头！

Excited state absorption cross sections are obtained through Z-scan curve fitting.

通过曲线拟合，得出了它们的激发态吸收截面。

Polarization, Propagator, Interaction Matrix, Cross Sections and Unitarity Bounds.

极化，传播，作用矩阵，截面和麽正极限。