customs (n.) 關稅，一國憑藉其主權法律，對進出口商品課徵勞務、通行費或稅金。 He is confident that a working knowledge of the U.S. customs laws and regulations will meet all of the company's current and future needs. （他深信美國海關法令和規章的專業知識，將能符合所有公司現在和未來的需求。）
customs duty (n. phr.) 關稅，國家海關當局對進口或某些出口活動，所徵收的稅金。 In certain cases, customs duties may be paid at a date later than the date the good is imported. （在某些案例中，關稅可能在商品進口數日後才付款。）
tariff (n.) 關稅，商品或勞務進口到一國時所課徵的稅金。 Customs duties on merchandise imports are called tariffs. （對進口商品所課徵的海關稅稱為關稅。）
duty rate (n. phr.) 稅率，產品在進口或出口所被課徵為稅則的產品總值百分比。 Duty rates are typically decided by the tariff classification for your goods. （稅率通常由產品的關稅類別所決定。）
impose (v.) 強加於，以威權或武力建立或實施某事物。 It is essential for the importer/exporter to keep up-to-date with any changes and how they may affect the duties imposed on their products. （進出口商必須要了解最新的局勢變革，以及這些變動會如何影響他們的產品關稅。）
When asked to identify the world's most dangerous creature, some people might say the lion or the tiger. Others might guess that the shark is the deadliest beast. But they would all be wrong. There is another, more dangerous creature that has killed far more people than any of these animals.
The box jellyfish is among the deadliest creatures of the seas. Also known as a sea wasp, this animal has venom that can easily kill a human. In fact, about a hundred people around the world die every year from box jellyfish stings. Box jellyfish can sting you in shallow water and they can sting you on dry land. So be careful where you step next time you're walking on a beach!
Killer creatures can come in small packages, like the golden poison dart frog. Found in Colombia, these bright little creatures can fit on the palm of your hand. But if you actually held one, you'd be dead in a matter of minutes. Just one of these little frogs carries enough poison to kill up to 20 humans.
Then there's the hippopotamus, or "hippo" for short. Hippos are found in sub-Saharan Africa. Many view these giant plant-eaters as cute and passive, but in reality, they're very dangerous. Some researchers have called hippos the most aggressive animals on Earth. Even lions and crocodiles realize the danger and tend to avoid hippos in the wild. Hippo attacks are believed to result in around 500 deaths every year in Africa.
But none of these animals are the deadliest. That title belongs to none other than human beings. Through murder, violence, and war, we have killed more people than any other animal has. It is estimated that during the 20th century alone, up to 188 million people were killed in various wars. It's hard for any hippo, jellyfish, or dart frog to compete with that sad statistic.