I am reading The Elements of Style and get stuck at the word flammable. There is the statement about the word:
An oddity, chiefly useful in saving lives. The common word meaning "combustible" is inflammable. But some people are thrown off by the in- and think inflammable means "not combustible". For this reason, trucks carrying gasoline or explosive are now marked flammable. Unless you are operating such a truck and hence are concerned with the safety of children and illiterates, use inflammable.
Explanation above shows that flammable and inflammable have the same meaning actually. To avoid the misunderstand, people now use flammable to illustrate the danger, which easily be gotten from the last but one sentence. However the last sentence's meaning is contradictory to this, I think, and some helps or advice are needed here for comprehension. Thanks.