。
The mountain rescue team is on standby around the clock.
Literal
Mountain-rescue-team [topic-は] 24-hours on-standby-doing.
A factual statement about emergency services. 山岳救助隊 (さんがくきゅうじょたい, 'mountain rescue team') is a long compound: 山岳 (mountains) + 救助 (rescue) + 隊 (squad/team). ２４時間 ('24 hours') functions as an adverb meaning 'around the clock.' 待機している (たいきしている, 'is on standby') uses the progressive ~ている for an ongoing state. Simple and informational — the kind of sentence found in a safety brochure or news report.