pod / casing / sleeve
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pod
The protective, usually elongated covering around the seeds of certain plants, especially legumes such as peas or beans.
Für das Gericht müssen die Erbsen zuerst aus den Hülsen gelöst werden.
For the dish, the peas first have to be removed from the pods.
You can almost always recognize the meaning of 'Hülse' from the context. If you are talking about food and plants, it means the shell or pod of vegetables. If it is about weapons or crime, it means a cartridge casing. In discussions about politics or ideas, the figurative meaning may occur.
Die Kinder sammelten die leeren Hülsen auf dem Schießstand.
The children collected the empty casings at the shooting range.
In a botanical context, 'Hülse' (pod) is often used with legumes such as 'Erbsen' (peas) or 'Bohnen' (beans). Typical verbs are 'aus der Hülse pulen' (to shell/pick out of the pod), 'schälen' (to peel/shell), or 'entfernen' (to remove).
Frische Bohnen schmecken am besten direkt aus der Hülse.
Fresh beans taste best straight from the pod.
This meaning is specific to the context of firearms. Typical adjectives are 'leer' (empty) or 'golden' (gold-colored). People often 'finden' (find) or 'sammeln' (collect) casings, usually after a shot.
Der Kommissar untersuchte die am Boden liegende Hülse.
The inspector examined the casing lying on the ground.
The figurative meaning is used almost exclusively in the fixed expression 'eine leere Hülse' (an empty shell). It is used to criticize the fact that a word, plan, or promise has no real content or value.
Seine Entschuldigung war nur eine leere Hülse, er meinte es nicht ernst.
His apology was just an empty shell; he did not mean it seriously.
This meaning of 'Hülse' (sleeve) as a component is a technical term from engineering and mechanical engineering. You will rarely hear this use in everyday life unless you work in a technical profession.
Wir brauchen eine passende Hülse, um die beiden Rohre zu verbinden.
We need a suitable sleeve to connect the two pipes.
cover / shell
'die Hülle' and 'die Hülse' sound similar, and both can mean something that surrounds something else. 'Hülle' is the more general word for an outer layer, a casing, or protection. 'Hülse' is more specific: it is often elongated or cylindrical, for example with plants, cartridges, or technical parts. The words can easily be confused, especially because of their similar form. If you are talking generally about protection around the outside, 'Hülle' usually fits; for certain tube-like or technical parts, 'Hülse' is more likely to fit.
Im Garten zeigte Mia ihrem Freund die leere Hülse einer Erbse.
In the garden, Mia showed her friend the empty pod of a pea.
Morgen kauft sie eine neue Hülle für ihren Reisepass.
Tomorrow she is buying a new cover for her passport.