背もたれが真っすぐのいすに背筋を伸ばして座る読み方
Update Required
To play the media you will need to either update your browser to a recent version or update your Flash plugin.
- 背もたれが真っすぐのいすに背筋を伸ばして座るの英語：sit upright in a straight-backed chair with one's spine pressed against the back of the chair
