But the return was no such easy matter: the stones were smooth and neatly cemented, and the rose-bushes and blackberry stragglers could yield no assistance in re-ascending.
然而回来可不是这么容易的事。 石头光滑，平整地涂了水泥，而那些蔷薇丛和黑莓的蔓枝也经不起攀登。
2
The commercial production and applications of diamond coating tools a re always restricted by the poor adhesion power between diamond coatings and cemented carbide substrates.