umschließen
to enclose
To completely surround or frame something or someone.
Eine hohe Hecke umschließt den gesamten Garten und schützt vor Blicken.
A tall hedge encloses the entire garden and protects it from view.

to enclose / embrace
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to enclose
To completely surround or frame something or someone.
Eine hohe Hecke umschließt den gesamten Garten und schützt vor Blicken.
A tall hedge encloses the entire garden and protects it from view.

'Umschließen' (to enclose / embrace) is an inseparable verb. The prefix 'um-' always remains attached to the verb, and the stress is on the stem: um-SCHLIE-ßen. The past participle is 'umschlossen'.
Die Stadtmauer umschloss früher das gesamte Zentrum.
The city wall used to enclose the entire center.
The meaning depends on the subject and object. Physical objects (wall, fence) enclose places. People embrace other people. Abstract terms (plan, law) include other concepts.
Ein dichter Wald umschließt das kleine Dorf.
A dense forest encloses the small village.
In the meaning 'beinhalten' (to contain) or 'umfassen' (to encompass), 'umschließen' (to include) belongs to formal written language. You often find it in official documents, contracts, or academic texts.
Der Begriff „Nachhaltigkeit“ umschließt sowohl ökologische als auch soziale Aspekte.
The term 'Nachhaltigkeit' (sustainability) includes both ecological and social aspects.
to contain / abstain
'enthalten' and 'umschließen' can both mean that something belongs to a whole. 'enthalten' is the normal word when talking about contents or components: a text, a drink, or a plan contains something. 'umschließen' often also has a spatial meaning: something lies around something else and surrounds it. In the meaning 'to include', 'umschließen' sounds rather formal. The words can be confused because both can express the idea of 'including' or 'enclosing'. If you are talking about contents, 'enthalten' is usually more natural. If something surrounds something else from the outside, 'umschließen' fits.

Eine hohe Mauer umschließt den alten Garten.
A high wall encloses the old garden.
Der Saft enthält viel Zucker.
The juice contains a lot of sugar.