We report our recent progress on extragalactic spectroscopic and continuum observations,
including HCN(J=1–0), HCO+(J=1–0), and CN(N=1–0) imaging surveys
of local Seyfert and starburst galaxies
using the Nobeyama Millimeter Array,
high-J CO observations (J=3–2 observations
using the Atacama Submillimeter Telescope Experiment (ASTE)
and J=2–1 observations with the Submillimeter Array) of galaxies,
and λ 1.1 mm continuum observations of high-z violent starburst galaxies
using the bolometer camera AzTEC mounted on ASTE.