By midnight the crowd had thinned.半夜时分，人群渐渐散去了。They thinned out a stand to create a lush forest tomorrow.他们除去了林场中多余的树木,以利来日森林长得更茂密.The stream had thinned down to a mere trickle.小河越来越窄,最后变成了涓涓细流....
The concepts of radiant emittance and of irradiance are complementary.辐射的发射强度和辐照度是两个互补的概念.Emittance and irradiance are meaningful measurements of flux at a specific surface.发射强度和辐照强度只有对一定表面上通量的量度才是有意义的.A high quality bea...