objective to explore the accuracy of ultrasound in the diagnosis of fetal abnormalities.

objective: to investigate the characteristics of prenatal ultrasonographic in diagnosing of congenital fetus malformation.

摘要目的: 探讨产前超声诊断先天性胎儿畸形的声像图特征.

the feasibility of applying bp network to identify the constitutive relation of geo materials was studied.

探讨了应用BP网络识别岩土材料本构关系的可行性.

necessary steps must be taken to ensure success.

必须采取必要措施来确保成功。

walk your dog only when absolutely necessary.

只有在绝对必要的时候才遛你的狗。

it doesn't appear necessary for them to wait.

他们似乎没必要等待。

it might be necessary to replace the old one.

也许有必要换掉旧的了。

it became necessary for him to clarify his intentions.

他发觉有必要澄清他的意图。

fresh recruits need to be ready for combat when it becomes necessary.

新兵需要做好准备，在必要时投入战斗。

the airship can stay aloft for multiple days when necessary to avoid possible dangers.

必要时，飞艇可以保持在空中多日以躲避可能存在的危险。

a cloth-bound bundle of necessary items was carried by hanging it over one shoulder.

用布捆扎的一包必需品被挂在肩上携带。

scientific undertakings and artistic endeavors differ primarily in their necessary connection to the notion of progress.

科学活动和艺术追求的主要区别在于它们与进步概念的必要联系。

unavoidable destruction is a necessary outcome of armed conflicts.

不可避免的破坏是武装冲突的必然结果。

we stand ready to implement all necessary measures to stop them...

我们已准备好实施一切必要措施来阻止他们...

the engine remained on in case a quick departure became necessary.

发动机保持运转以防需要迅速离开。

one easy way to improve these triggers is to lighten the trigger spring (part 13).

最简单的方法就是换轻一点的板机弹簧（13号零件）。

one step behind you are hundreds of thousands who are awakening.

在你身后的一步是数以千计的人苏醒的一步.

the aggressive weeds threaten to choke his small pond, rapidly overtaking every inch of the water.

这些侵略性杂草可能会堵塞他的小池塘，迅速覆盖水面的每一寸。

vehicles and pedestrians choke the narrow village streets.

车辆和行人堵塞了村庄狭窄的街道。

the assailants dragged him to a nearby building's doorway and attempted to choke him with his own necktie.

袭击者将他拖到附近一栋楼的门道处，并试图用他自己的领带勒他。

a toddler might choke on the doll's loose hair...

小宝宝可能会被洋娃娃散落的头发噎住窒息...