Tus Hlau Hlau Hlau Hlau Hlau Hlau

Cov ntsia hlau feem ntau yog siv hauv cov chaw hauv qab no:
Kev tsheb thauj khoom thauj: Cov nqaj hluav taws xob yog cov txheej txheem tsim nyog rau cov tsheb ciav hlau mus ncig ntawm kev tsheb nqaj hlau thiab siv los muab cov ciav hlau ruaj khov. Seb nws yog ib qho kev tsheb ciav hlau dog dig, lub siab-ceev cov tsheb ciav hlau los yog ib qho chaw subway lossis txoj kev tsheb nqaj hlau yuav tsum tau los txhawb thiab qhia cov tsheb ciav hlau.
Subway System: Txoj kev tsheb subway yog cov kev thauj mus los hauv cov nroog loj. Cov kev sib txuas kuj tseem yog ib feem tseem ceeb ntawm cov kab subway, kom ntseeg tau tias cov tsheb ciav hlau khiav zoo hauv cov khoom lag luam.
Cov tsheb ciav hlau hluav taws xob: Kev Railway System yog ib txoj kev tsheb nqaj hlau uas siv hluav taws xob kom tsav tsheb ciav hlau. Cov nqaj hlau kuj tseem siv los ua cov ciav hlau rau cov tsheb ciav hlau los khiav.
Kev kub ceev-ceev: kev tsheb ciav hlau siab yog ib txoj kev tsheb ciav hlau nrog cov tsheb ciav hlau ceev uas yog cov cab kuj ua haujlwm. Cov ntsia yuav tsum muaj peev xwm tiv thaiv qhov cuam tshuam thiab kev thauj khoom hnyav ntawm tsheb ciav hlau siab kom ntseeg tau tias kev nyab xeeb thiab ruaj khov ntawm cov tsheb ciav hlau ceev.
Kev Siv Siv: Ntxiv rau kev thauj mus los, cov hlua hlau kuj tseem siv tau rau hauv qee qhov chaw muaj kev lag luam, thiab lwm yam, los muab lub hauv paus tsav tsheb rau tsheb ciav hlau lossis tsheb.
Hauv ntej, cov hlua khi ua si lub luag haujlwm tseem ceeb hauv kev ua haujlwm ntawm ntau txoj kev tsheb thauj mus los, txhawb nqa cov khoom ruaj khov, thiab ua kom muaj kev nyab xeeb.