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1.Rottweiler breeders aim at a dog of abundant strength, black coated with clearly defined rich tan markings, whose powerful appearance does not lack nobility and which is exceptionally well suited to being a companion, service and working dog.
罗威那犬的繁殖师认为，一条罗威那犬应该具有充沛的力量，毛色油黑，并有明显的棕褐色斑纹，虽然外形勇猛，但是仍不乏高贵气质，能够出色地胜任作为伴侣犬，服务犬和工作犬的任务。收藏指正
2.In the process of drilling oil and gas wells, the casing inwall wear will happen owing to the friction between drill string and casing, thus reducing the collapsing strength of wearing casing, which direct consequence will be the decrease in oil/gas well servoice life, more serious, will lead to the well’s being partially or wholly abandoned.
油气井钻井过程中,由于钻具和套管相互摩擦,造成套管内壁磨损并引起磨损套管抗挤强度降低,直接后果是:降低油气井寿命,严重时将导致某段油气井报废或整口油气井报废。收藏指正
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