second-class

adj.

第二流的；次要的；第二地位的；二类邮件的

adv.

二类地；乘二等车地；坐二等舱地；

Quantization of relativistic systems with boson and fermion first- and second-class constraints
Terabus: Terabit/Second-Class Card-Level Optical Interconnect Technologies
Path integral quantization of field theories with second-class constraints ☆ ☆☆
Migrants as second-class workers in urban China? A decomposition analysis ☆
AN Sp(2) COVARIANT FORMALISM OF A GENERALIZED CANONICAL QUANTIZATION WITH SECOND-CLASS CONSTRAINTS
An ${rm Sp}(2)$ covariant formalism of a generalized canonical quantization with second-class constraints.
Tests for Second-Class Currents in Nuclear Beta Decay
Hamiltonian embedding of a second-class system with a Chern-Simons term
Hamilton-Jacobi treatment of second-class constraints.
A study of the axial-vector form factor and second-class currents in antineutrino quasielastic scattering