潮汐

潮汐 (cháoxī) refers to the alternate rising and falling of the sea, which usually happens twice a day. Think of it as the tide.

High tide is 涨潮 (zhǎngcháo). 涨 (zhǎng) means to rise, and 潮 (cháo) is short for tide.

Low tide is 落潮 (luòcháo). 落 (luò) means to fall or drop.

No, 潮汐 specifically refers to the ocean tide. You wouldn't use it for, say, a river rising and falling.

Sometimes just 潮 (cháo) is used, especially in compounds like 涨潮 or 落潮. But 潮汐 is the full, formal word.

You could say: 月亮引力引起潮汐。 (Yuèliàng yǐnlì yǐnqǐ cháoxī.) This means: The moon's gravity causes the tides.

A tidal wave is a common, though technically incorrect, term for a tsunami. In Chinese, a tsunami is 海啸 (hǎixiào). While both involve water movement, 潮汐 is the regular, predictable rise and fall, and 海啸 is a destructive wave caused by seismic activity.

Yes, it's a common word, especially if you're talking about the ocean, beaches, or marine life. It's good to know for B1 level.

Not directly with 潮汐 itself, but the concept of 'tide' or 'flow' can be found in expressions like 潮流 (cháoliú), which means 'trend' or 'current'. For example, 跟上潮流 (gēn shàng cháoliú) means 'to keep up with the trend'.

潮汐 (cháoxī) refers to the overall rise and fall of the sea level. 浪 (làng) means 'wave'. You can have waves regardless of whether it's high tide or low tide. Waves are the individual movements on the surface of the water, while tides are the larger, slower changes in the water level itself.