tác hại has 2 syllables: tác: sắc (high rising) · hại: nặng (low, short, glottalized). You can also listen to it on this page in both Northern and Southern accents.
How common is tác hại in Vietnamese?
tác hại is among the 8,000 most-used Vietnamese words, CEFR level A2.
How is tác hại used in a sentence?
For example: Hút thuốc có nhiều tác hại cho sức khỏe. (Smoking has many harms to health.); Chúng ta cần giảm tác hại đến môi trường. (We should reduce harm to the environment.).
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