It can loosely be described as travel that takes place at regular intervals—often in an annual cycle—that may involve many members of a species, and is rewarded only after a long journey.
它可以比较粗略地描述成是发生在固定周期（这个周期通常是一年一次）的包含某一个物种很多成员的集体旅行，并且只有在长途旅行后才有回报。
There are often two different types of health insurance you can consider buying: international travel insurance and student insurance in the country where you will be going.
通常你可以考虑购买两种不同类型的健康保险：国际旅行保险和你将要去的国家的学生保险。
This focusing is the main reason that even relatively weak sounds in the ocean, especially low-frequency ones, can often travel thousands of miles.
正是由于这种集声，即使是海洋中相对微弱的声音，尤其是低频声音，也能传播数千英里。
As grandparents have been saying for generations, kids would travel miles to school in the countryside (often on foot) .
就像祖辈们世世代代都在说的那样，孩子们去乡下上学通常要走好几英里。
It generally covers a wide variety of medical services, and you are often given a list of doctors in the area where you will travel who may even speak your native language.
它通常包括各种各样的医疗服务，你通常会得到一份你将要访问的地区的医生名单，这些医生甚至会说你的母语。
Poorer people are at higher risk of injury because they often live, work, travel and go to school in unsafe environments.
较贫穷者遭受伤害的危险更高，因为他们常常在不安全的环境中生活、工作、旅行和上学。
Travel in the developing world often involves appallingly long, uncomfortable bus journeys with speed-freak drivers, doubtful safety standards and aircon that is permanently set to 'Max'.
旅行在第三世界国家经常需要乘坐不舒服的、不安全的长途公车。公车的安全标准令人怀疑，空调被长期设定成最大。
My wife and I often say, only half in jest, that our frequent travel separations are one key to our marriage’s continuing freshness after 30 years.
妻子和我常半开玩笑说，为了旅游频繁分离，这就是我们保持30年婚姻新鲜度的法宝，真是“小别胜新婚”（ 译者好羡慕，译者好烦自己的老婆 ）。
For example, 60% of survey respondents in France said they went online “always” or “often” to compare travel prices, while 56% researched accommodation and 54% used the Web to choose a destination.
举例来说，60%的法国受访者这表示他们“一直”或“经常”通过互联网比较不同的旅游产品价格，有56%的搜索是关于住宿资讯，有54%的受访者则运用互联网选择旅游目的地。
In the United States, earthquake engineers who often travel to the scene of a major quake within days have been unable to go to Japan because of concerns about radiation.
在美国，地震学家通常都会在地震发生后几天内赶到现场，但这次由于担心核辐射而无法去日本。
Many of you time travel in dream state quite often, and therein is the key to how it will be optimally done in expansive conscious states.
你们很多人在梦境中就经常进行时间旅行，在那里面就蕴含着如何在意识扩展状态最优地实现它的关键。
Online travel agencies, on the other hand, experience either smaller increases in conversion than supplier websites or, more often, no change at all in conversion rates.
另一方面，在线旅行社网站的转化率相比供应商网站有小幅的提高，但是在多数情况下是没有什么变化。
Quite often, human interactions are needed in the course of a process (e.g., travel approval or loan approval).
很多时候在流程中都会需要人工交互(如出差审批或贷款审批)。
Many parents take matters into their own hands. They post fliers in places where children are often sold and travel the country to stand in front of kindergartens as they let out.
很多父母自己动手，在孩子失踪的地方贴上小广告，去农村站在幼儿园门前等着孩子们出来，一个个看。
A thermometer often now, and more often back in the early 1800s, consists of a glass tube up which a column of mercury or alcohol can travel from a reservoir at the base.
现在常见的温度计由一个玻璃管和一个位于底部的贮液槽组成，贮液槽中的水银或酒精沿玻璃管上升形成液柱。
Time is often expressed as travel in space: "We're coming up on Christmas."
时间经常被用来表达空间的穿越：“我们圣诞节回来”。
Mostly found in the Southern and Southwestern portions of the United States, Africanized Honeybees often travel in swarms to find a new hive.
非洲蜜蜂在美国南部和西南地区较为常见。
Travel often involves a flight, so it makes sense to create an Airline class (shown in Listing 2) as well.
旅程中经常要包含飞行，所以还应该创建一个airline类(如清单2所示)。
Title songs from her previous albums, such as Travel with Sound and Fly for You, often dealt with her perception of and confusion in relationships.
她前几张专辑中的主打歌，例如《旅行的意义》和《失败者的飞翔》，往往会探讨她对于情感的看法和困惑。
First, the ones who study abroad are no longer for the only purpose-study, they are often born in a rich family, so besides study, they want to travel more.
第一，那些在国外学习的人学习不再是唯一的目的，他们一般都出生与优越的家庭，所以除了学习，他们更想要旅游。
Bulgaria is a nation that isn't often mentioned in the news or in many books on European travel.
保加利亚这个国家，很少出现在新闻中或是有关欧洲的旅行书中。
They often travel by sea in summer.
夏天他们常常乘船去旅行。
Mountain gorillas are highly social animals that often live and travel in groups. So, when babies are kidnapped, parents or other relatives are almost always slaughtered in the process.
山地大猩猩是高度群居的动物，它们通常成群地生活和游走。因此，在大猩猩宝宝被捕获的过程中，它们的父母或其它亲人几乎总是惨遭杀害。
A career in this field often involves travel.
在这个领域的职业还包括旅行。
I'm based near Surabaya in Indonesia, but quite often travel around SE Asia, always with a Sony ICF-SW7600GR portable radio.
我基本靠近印度尼西亚的苏拉巴亚附近，但时常在东南亚周围旅行，总带着索尼ICF-SW7600GR便携机。
I'm based near Surabaya in Indonesia, but quite often travel around SE Asia, always with a Sony ICF-SW7600GR portable radio.
我基本靠近印度尼西亚的苏拉巴亚附近，但时常在东南亚周围旅行，总带着索尼ICF-SW7600GR便携机。
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