The manufacturer recommends machine-drying at low temperatures; high temperatures may result in excessive shrinkage and shorten the life of a garment.

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介詞 at 可與 度數/ 價格 / 年齡 / 速度 等與數字有關的名詞並用.

Water boils at the temperature of 100 .

Tom drove at the speed of 30 miles per hour.

Sandy had her first child at the age of 26.

I bought this piece of crystal at the price of NT$ 500.

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