庄曜祯师兄,咱查了两个英译本,「色离」皆译为「escape from form」。
Bhikkhu Bodhi 的译文:The removal and abandonment of desire and lust for
form: this is the escape from form.
http://suttacentral.net/sn22.57/en/
Thanissaro Bhikkhu 的译文:The subduing of desire & passion for form, the
abandoning of desire & passion for form: that is the escape from form.
http://www.accesstoinsight.org/tipitaka/sn/sn22/sn22.057.than.html