“十八个”造句
经过充分切刻的 “ 光彩夺目 ” 的钻石有五
十八个小平面.
A fully cut'brilliant'diamond has 58 facets.
通过环氧化和氧化就得到外消旋的含
十八个碳的昆虫返动激素.
Epoxidation and oxidation gave the racemic C 18 - juvenile hormone.
十八个月来这样的报告都已听腻了.
Such reports had been routine for eighteen months.