twopennyadj.两便士的；不足道的；低廉的n.从前的一种啤酒；头twonum.二；两个Two-dimensional quasiperfect supplementary quaternary array准最佳四元二维互补阵列two-dimensional maximum between-cluster average deviation2维最大类间平均离差法two-dimension three-temperature heat conduction equations二维三温热传导方程组two-dimensional three-temperature heat conduction equation二维三温辐射热传导方程Two-phase Fluid Lubrication Technology--Oil-air Lubrication气液两相流体冷却润滑技术-油气润滑two-dimensional maximum scatter-difference discriminant analysis二维最大散度差鉴别分析

1. People began to leave the meeting by ones and twos.
   人们开始三三两两地离开了会场。
2. They sit in two and three on the trim barber lawn.
   他们三三两两地坐在修剪平整的草坪上。