Based on the curves representing different propagation mechanisms from the preceding text, the overall path loss between these two points, "most of the time," is primarily dominated by the Ducting mode.
"Ducting" refers to air ducting.
That is, without an atmospheric waveguide, the probability of QSO completion between these two points is relatively low, relying on diffraction and atmospheric scattering through mountain peaks. (In other words, it's difficult to overcome path loss solely by using high-gain antennas.)
Zhoushan<->Hangzhou: This propagation path is primarily along the coast, with abundant humidity and favorable conditions for ducting formation. The environmental conditions are much better than those in inland areas, making it worth trying.
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