恒例: an annual spring cleanup and an end-of-trip custom
Identify the annual occasion for neighborhood cleanup and the trip-ending occasion for group photographs, without imposing one interval on both customs.
An annual neighborhood cleanup
春の清掃は町内会の恒例行事だ。 describes the spring cleanup as an annual neighborhood event. 恒例, read こうれい, concerns a regular custom, and the Korean and English translations supply the annual meaning in this example.
Read both the spring event and its annual occasion. The sentence does not give this year's exact cleanup date or report that work was completed on a particular day.
The custom at the end of a trip
旅の最後に皆で写真を撮るのが恒例になった。 says that taking a group photograph at the end of a trip has become a tradition. The occasion is the trip's end, without a separately specified final-day date.
恒例になった reports the practice becoming customary. It does not give the number of trips that year, establish that a photograph was already taken on this trip, or count the photographs.
The occasion structuring each custom
The cleanup is an annual spring event; the photograph is an end-of-trip custom. Their separate occasion references prevent defining every 恒例 as once per year or as a daily activity.
A custom describes a recurring practice of the relevant group. Do not add a legal duty or impose the cleanup's annual interval on the trip photograph.
What occasion structures the two customs described by 恒例?
Show the answer and why
The cleanup is an annual spring event. The group photograph is customary at the end of a trip. No annual interval or specific photograph date is supplied for the latter.