想要减肥就必须控制食欲。

If you want to lose weight, then you need to control your appetite.

Source: Tatoeba

Sentence Composition

1 想要 xiǎngyào
  1. to want to
  2. to feel like
  3. to fancy
  4. to care for sb
  5. desirous of
2 减肥 jiǎnféi to lose weight
3 就 jiù
  1. (after a suppositional clause) in that case; then
  2. (after a clause of action) as soon as; immediately after
  3. (same as 就是 jiùshì) merely; nothing else but; simply; just; precisely; exactly
  4. only; as little as
  5. as much as; as many as
  6. to approach; to move towards
  7. to undertake; to engage in
  8. (often followed by 着 zhe) taking advantage of
  9. (of food) to go with
  10. with regard to; concerning
  11. (pattern: 就 jiù ... 也 yě ...) even if ... still ...
  12. (pattern: 不 bù ... 就 jiù ...) if not ... then must be ...
4 必须 bìxū
  1. to have to
  2. must
  3. compulsory
  4. necessarily
5 控制 kòngzhì to control
6 食欲 shíyù appetite