at need中文什么意思

困难时

• need:    n. 1.必要,需要。 2.缺乏,不 ...
• be in need of:    很需要
• if need be:    如果需要的话

例句与用法

1. At need one sees who his friend is
   处于困境时可以看出谁是自己的朋友
2. Leave me a small supply of biscuit , a gun , powder , and balls , to kill the kids or defend myself at need , and a pickaxe , that i may build a shelter if you delay in coming back for me .
   给我留下一点饼干，一支枪，一点火药和子弹，这样我就可以打些小山羊或在需要的时候自卫，再留下一把鹤嘴锄，要是你们回来得晚了些，我可以给自己搭一间小茅屋。 ”
3. They approached the door ; which was of an arched form , and flanked on each side by a narrow tower or projection of the edifice , in both of which were lattice - windows , with wooden shutters to close over them at need
   她们走近了大门那建筑物有一座拱形门洞，两侧各有一座细高的塔楼或者说是突出的前脸，上面镶着格子窗，里面还有木制的百叶窗，必要时可以关上。
4. They approached the door ; which was of an arched form , and flanked on each side by a narrow tower or projection of the edifice , in both of which were lattice - windows , with wooden shutters to close over them at need
   她们走近了大门；那建筑物有一座拱形门洞，两侧各有一座细高的塔楼或者说是突出的前脸，上面镶着格子窗，里面还有木制的百叶窗，必要时可以关上。
5. It is used all of this to form a utility automatic test system . aiming at needs of the applications , the thesis introduce the uav wireless data link system and it ' s test target firstly , and then introduce the knowledge of the automatic test system
   论文中针对实际应用的需要，首先分析了无人机数据链性能指标的测试方法，然后介绍了自动测试系统的知识，最后将无人机数据链性能指标嵌入自动测试系统的判决准则中，组建出无人机数据链自动测试系统。