北京的无形之手
the invisible hand of Beijing
菠菜的无公害生产
Pollution-Free Production of Spinach
不合法的无线电发报机设备
illegal radio transmitter equipment
不可转让的无息期票
non-negotiable， non-interest-bearing promissory note
non-negotiable
non-interest-bearing promissory note
不连续的无限群
discontinuous infinite group