伦敦是个大城市，游客必须乘公交或地铁才能出行。

London is such a large city that visitors must use buses and the underground railway to get about.

Source: Tatoeba

Sentence Composition

1 伦敦 Lúndūn London, capital of United Kingdom
=2 是 shì
  1. to be (followed by substantives only)
  2. correct; right; true
  3. (respectful acknowledgement of a command) very well
  4. (adverb for emphatic assertion)
=2 是 shì variant of 是 shì
=3 个 gě used in 自个儿 zìgěr
=3 个 gè
  1. (classifier used before a noun that has no specific classifier)
  2. (bound form) individual
=3 个 gè variant of 个 gè
4 大城市 dàchéngshì major city; metropolis
5 游客 yóukè
  1. traveler; tourist
  2. (online gaming) guest player
6 必须 bìxū
  1. to have to
  2. must
  3. compulsory
  4. necessarily
=7 乘 Chéng surname Cheng
=7 乘 chéng
  1. to ride
  2. to mount
  3. to make use of
  4. to avail oneself of
  5. to take advantage of
  6. to multiply (math.)
  7. Buddhist sect or creed
=7 乘 shèng
  1. (archaic) four horse military chariot
  2. (archaic) four
  3. generic term for history books
=7 乘 chéng old variant of 乘 chéng
8 公交 gōngjiāo
  1. public transportation
  2. mass transit
  3. abbr. for 公共交通 gōnggòngjiāotōng
=9 或 huò
  1. maybe
  2. perhaps
  3. might
  4. possibly
  5. or
=9 或 yù
  1. Original form of 國／国 (guó, “country”).
  2. Original form of 域 (yù, “range; territory”).
10 地铁 dìtiě
  1. underground railway; subway
  2. subway train
11 才能 cáinéng
  1. talent
  2. ability
  3. capacity
12 出行 chūxíng
  1. to go out somewhere (relatively short trip)
  2. to set off on a journey (longer trip)