O - rings should be cleaned or replaced as necessary and lightly greased with the fda approved silicon grease which is also furnished with the service kit 如果必要的话， o形环应该清洗或更换，并用随维修组件提供的通过美国食品及药物管理局（ fda ）认证的硅润滑油进行轻微的润滑。
Textual encoding is preferable for several reasons , the most critical of which may be that it is easier to debug and easier to roll up a special implementation when the need arises 优先选择文本性编码有几种原因，但最重要的可能是因为它容易调试，而且如果必要的话容易完成专门的实现。
The explanation for insensitivity to smell seems to be that brain finds it 14 to keep all smell receptors working all the time but can 15 new receptors if necessary 对气味不敏感的解释，好像是由于大脑发现保持全部嗅觉感受器持续工作( 14 )效率不高，但如果必要的话可以( 15 )产生新的感受器。
People need to understand that thinking is an acquired skill . figuring things out takes practice , failure , retooling one ' s plans , and trying an alternate route if necessary 人们需要明白思考是一种必备的技能。把事弄清楚需要实践、经历失败、修整计划以及如果必要的话，需要尝试另一条路。
Intercept the fluid medium upstream of the valve to be inspected with a shut - off valve and ensure that the subject valve is not under pressure ( vent downstream , if necessary ) 截取阀门上游的流体介质，用一个关闭阀门来进行检测，确保相关的阀门不处在压力下(如果必要的话，排除下游的流体介质) 。
The heavy battery ( 155 mm ) and the cannons of 105 mm occupied fire positions to the west of sapadni in order to furnish indirect fire support on rostov and , if necessary on the river don ' s bridges 重炮连（ 155毫米）和105毫米火炮在萨帕德尼西面占领发射阵地，以提供对罗斯托夫以及（如果必要的话）对顿河上的桥梁的间接的火力。
I am also a nature preserver myself , and all our practitioners are not allowed to cut trees unnecessarily . but if necessary , we cut them - in order to build in that space some better institution for other people 我自己也是自然的保护者，我也不允许我们所有的同修滥砍树木，但是如果必要的话，我们会砍一些树来盖房子，这样可以有更好的建筑让人们使用。
Although the approach ? which valued rio tinto at ? 68 . 8bn ( $ 145bn ) , excluding debt ? was rejected out of hand , bhp is thought to be ready for a protracted campaign and analysts predicted it would go hostile if necessary 尽管必和必拓此次接洽（将收购力拓的价格定在688亿英镑(合1450亿美元) ，其中不包括债务）立即遭到了拒绝，但外界认为，必和必拓为一次长期的行动做好了准备，同时分析师预计，如果必要的话，该公司可能转而进行敌意收购。
" to the extent that we have americans coming forward to provide us information , whether it be a private citizen or a private corporation or anybody in america they can provide the government information , we take it very seriously that they should : one , feel comfortable in providing that information that their sources will be protected and that we will act on it if necessary , we appreciate what they did 在某种程度上，我们鼓励市民积极提供给我们信息，不管是个体市民还是个体公司或者任何可以给政府提供信息的人，我们都回认真地对待，使得他们会：第一，在提供信息是舒服的感觉到他们的来源受到了保护，而且如果必要的话我们也会采取行动。
