他们的快乐
处于。。。的尖端 处于。。。。边缘 例如:We are on the cusp of a global revolution in teaching and learning. 我们正处在教与学全球性变革之巅。
亲爱的玉玉
尖端技术 [词典] [法] sophisticated technique; [例句]我们正在开发的是一种在澳大利亚从未有过的尖端技术。What we are planning is cutting-edge technology never seen in Australia before