says that two factors work together to bring about a result neither would produce alone: "combined with", "coupled with". It follows nouns joined by
, and the result comes after the comma. It is written, formal Japanese – news, reports, speeches. In conversation, AとBが重なって or Aもあって says the same.
、。
His talent and his hard work together brought him great success.
、。
The weak yen coupled with good weather led to a surge in foreign tourists.
、。
The extreme heat combined with the water shortage caused serious damage to crops.
The result can be good or bad. 相まって says only that the factors add up.
Particles around 相まって
The two factors can stand side by side as AとBが相まって, or one can be the subject and the other a partner: AがBと相まって. With only one factor named, it takes と, and the other factor is understood from context.
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The beautiful scenery together with the quiet surroundings makes it an ideal resort.
、。
The falling birthrate, coupled with the aging population, is making the labour shortage serious.
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With the good weather on top of that, the venue was packed with people.
adds one more factor to something already mentioned, and a clause before it takes
.
、。
Being close to the station helps too, so this shop is always crowded.