co1 is a/the anterior (zootomy)/cranial/cephalic end (anatomy)/superior end (human anatomy) of body/object cl1; co1 (subevent) is at the starting point of long event/time-intervall cl1.
co1 is a/the anterior (zootomy)/cranial/cephalic end (anatomy)/superior end (human anatomy)/fore/bow (nautical)/nose (skateboard etc), of body/object cl1; co1 (subevent) is at the ending point of long event/time-intervall cl1.
x1 is the temporal direction of/toward solstice x2 (event or spacetime coordinates or season (usually specify year); default: Summer solstice) from origin/in reference frame x3 at location/for body x4 and with respect to orbit/sun x5.
x1 (individual, mass, or population (set?)) and x2 (individual, mass, or population (set?)) are capable of mutually interbreeding/producing offspring with one another.
x1 is the conceptualized/ideal/abstract shape of a crescent/concave 'horned' (then convex rounded) form/geometric partially-concave lune formed by/manifested from the intersection x2 (parameters) of two-dimensional circular disks immersed (embedded) in geometry/defined by metric x3
mekso operator: in ordered tuple/list/vector/sequence X1, replace the X2th entry with term X3 of appropriate type, and leave all other entries untouched (optional: where the index for the very first/leading/header entry is X4).
translation marker - original/native version: marks a construct as having been translated and therefore particularly (possibly, but not necessarily) susceptible to the errors or limitations associated with translation (especially if the translator is unsure of the best result/option)
x1 is the conceptualized/ideal/abstract shape of a crescent/concave 'horned' (then convex rounded) form/geometric partially-concave lune formed by/manifested from the intersection x2 (parameters) of two-dimensional circular disks immersed (embedded) in geometry/defined by metric x3