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必须旅行
1、must he───他一定要吗
2、must make───必须使
3、must like───一定喜欢
4、must───n.(Must)（美）穆斯特（人名）；n.绝对必要的事物；待发酵的葡萄汁；发霉，潮气；aux.必须；一定；应该，得
5、the must───必须的
6、must of───必须的
7、must s───必须
8、travel───v.长途旅行；经过（某地区）；（非正式）经受得住旅行；（物体，放射线）移动；行进，传送；经得住长途运输；广为流传；受喜爱；（带球）走步；（非正式）车辆快速移动；n.旅行；（设备）旅行用的；（机器部件的）运动范围（或速度、模式）
9、be must───必须
1、Generally, the higher the aircraft, the greater the distance the shock wave must travel, reducing the intensity of the sonic boom.───一般，飞机飞得越高，冲击波（到达地面）所需要移动的距离就越大，使得音爆强度减弱。
2、The lower the sun- the longer is the path that the light rays must travel through the air.───听听天空。太阳越低，光线穿越空气的路程越长。
3、The sun's glancing rays are spread over a greater surface area and must travel through more of the atmosphere before reaching the earth.───太阳射线分布在更大的表面积上，必须通过更厚的大气层中才能到达地表。
4、Everyone must travel by foot or boat, visitors and locals alike.───人们动则步行或乘船，游客和当地人概不例外。
5、It is the morphology of these organs that dictates the pattern of airflow disturbances through which pollen must travel.───正是这些ShengZhi器官的形态规定着气流干扰的模式，而花粉的传播则必须经由这一模式来进行。
6、My brother is a road warrior who must travel two or three times every week to visit customers in cities far from his home.───我的兄弟是位经常出差的商人，每周要出差两到三次，到离家很远的城市去拜访客户。
7、If you must travel, inform a friend or relative of your proposed route and expected time of arrival.───如果必须出行，告知朋友或者家人你的计划路线和预计回来的时间。
8、To reach Japan ships must travel for 20 days, passing near pirate-infested waters.───需要航行20天，穿越遍布海盗的水域才能抵达日本。
9、Stella the storyteller has lost her suitcase and Barney and his friends must travel to France, Mexico and Canada to return it to her.───史丹娜的行李不见了，班尼和一班朋友便前往法国、墨西哥和加拿大把她的行李找回来。
1、You must travel across this highway, whether you are an organization purchasing supplies or a consumer ordering a movie on demand.
2、If must travel on official business, after cleaning up again leaves the gate, do not have to come back facing a room mosquito and the insect.
3、If you must travel at night in dangerous areas, turn on the interior light in your car.
4、In thanksgiving, he built a house of prayer, and in one of its corners he put an inscription: Sometimes one must travel far to discover what is near.
5、Sedimenting particles in the horizontal-head centrifuge must travel the entire length of the liquid in the tube.
6、The warriors always accompany them when they must travel long distances to find green grass.