tractor-trailer – n. large truck used to transport loads of cargo

heatstroke – n. serious medical condition caused by staying too long in the heat

immigrant – n. person who goes to a country with the intention of living there

human smuggling – n. the importation of people into a country illegally, with those being smuggled generally cooperating

migrant – n. person who changes country of residence, especially to find work

human trafficking – n. the importation of people into a country against their will, for the specific purpose of exploiting them to work in the sex trade or other forced work situations

persecution – n. treating someone cruelly or unfairly

journey – n. traveling from one place to another

calculus – n cost or value of something

famine – n. situation in which many people do not have enough food to eat