in sections / in places
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in sections
Describes that something applies only on certain sections or parts of a route or area, but not throughout.
Die Straße war streckenweise vereist, also musste man vorsichtig fahren.
The road was icy in sections, so you had to drive carefully.
The word consists of the noun 'Strecke' (route, stretch) and the ending '-weise'. This ending turns nouns into adverbs and here means 'in sections' or 'in places'.
Die Bäume am Wegesrand spenden streckenweise Schatten.
The trees along the roadside provide shade in sections.
As an adverb, 'streckenweise' (in sections) is flexible. It can stand at the beginning of the sentence (position 1), which leads to inversion, or it can be placed in the middle of the sentence.
Streckenweise war der Weg sehr matschig.
In sections, the path was very muddy.
'Streckenweise' (in sections) is used very frequently in weather and traffic reports to describe conditions that are not the same everywhere. Typical combinations are 'streckenweise Nebel' (fog in places), 'streckenweise glatt' (slippery in places), or 'streckenweise Stau' (traffic jams in sections).
Achtung, auf der A5 kommt es streckenweise zu dichtem Nebel.
Attention: on the A5, there is dense fog in places.
partly
'teilweise' and 'streckenweise' both say that something does not apply everywhere or not completely. 'teilweise' is more general: it can refer to amounts, content, people, times, or areas. 'streckenweise' fits especially when you are thinking of a route, a path, or an area. The words can be confused because both express a limitation. As a practical rule: when it is about a path or certain sections of a route, 'streckenweise' is more precise. In many other cases, 'teilweise' is more natural.
Auf dem Radweg ist der Boden streckenweise sehr uneben.
On the bike path, the ground is very uneven in sections.
Der Bericht ist teilweise richtig, aber einige Zahlen stimmen nicht.
The report is partly correct, but some of the figures are wrong.