The system describes simple spatial-motion events using verbs such as `pick up', `put down', `push', `pull', `drop', and `throw'.
(The system; describes; simple spatial-motion events using verbs such as `pick up', `put down', `push', `pull', `drop', and `throw') (simple spatial-motion events; using; verbs such as `pick up', `put down', `push', `pull', `drop', and `throw)
The system simple spatial-motion events
describes using
simple spatial-motion events using verbs such as `pick up', `put down', `push', `pull', `drop', and `throw'
verbs such as `pick up', `put down', `push', `pull', `drop', and `throw