Chinese · Pronunciation Guide
lü-SUH, with a rounded front vowel English does not have — say "lee" and then round your lips without moving your tongue. Both syllables fall.
lǜsè
Two fourth tones in a row and no sandhi to soften them. As always with a falling-falling pair, the first is shortened: lǜ drops fast and does not descend all the way, while sè gets the fuller plunge. Making them identical produces a stiff, hammered rhythm.
Listen: 绿色
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草是绿色的。
Cǎo shì lǜsè de.
The grass is green.
Listen: 草是绿色的。
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草是绿色的。 opens with cǎo, a third tone with an aspirated c — a teeth-ridge "ts" with breath — then shì falls, and then two more falls in lǜsè, and finally the toneless de. That is three consecutive falling syllables, which English rhythm badly wants to level out. Restart each one at the top rather than letting the pitch slide continuously downhill.
The overwhelming majority of learners say "loo", replacing ü with plain u. That is a different vowel and, in other words, a different meaning altogether. The trick that works: say "lee" out loud, freeze your tongue exactly where it is, and then purse your lips. Do not let the tongue slide backward when the lips move — that backward slide is precisely what turns ü into u.