1. Introduction

2. Observations
2.1. 12CO (J=2–1), 13CO (J=2–1), and C18O (J=2–1)
2.2. 12CO (J=1–0), 13CO (J=1–0), and C18O (J=1–0)

3. Results
3.1. Spatial distribution
3.2. Velocity structure
3.3. Line ratios

4. Analyses
4.1. Physical properties derived from observed lines
4.2. Large velocity gradient analyses

5. Discussion
5.1. Relationship of the cloud physical properties and star forming activity
5.2. Effect of the surrounding environment

7. Summary