Exegesis:

chōrion (only here in Mark) ‘place,’ ‘plot of land,’ ‘field,’ ‘estate’: it is from John 18.1 that we get the designation ‘garden’ (kēpos).

Gethsēmani (only here in Mark) ‘Gethsemane’: the word is derived from gath-semaneʿ, ‘oil-press.’

kathisate (cf. 9.35) ‘you sit here.’

heōs proseuxōmai ‘until I pray’: the aorist of the verb may be taken here to refer to the action as completed, i.e. ‘until I finish praying’; the meaning, therefore, is ‘while I pray.’

proseuchomai (cf. 1.35) ‘pray.’

Translation:

The word employed to render place must be capable of indicating a small area such as a garden. In some languages, however, there is no equivalent of the generic term place, and one must use a more specific designation, e.g. ‘grove of trees,’ implying an area which is planted and cared for.

They must include not only the disciples, the immediately preceding third person plural referent, but also Jesus. In some languages one can only overcome this syntactic problem by saying ‘Jesus and his disciples went.’ Otherwise the implication is that the disciples went off to the garden of Gethsemane without Jesus.

For pray see 1.35.

Quoted with permission from Bratcher, Robert G. and Nida, Eugene A. A Handbook on the Gospel of Mark. (UBS Handbook Series). New York: UBS, 1961. For this and other handbooks for translators see here .