以下为句子列表：
英文: Stem: The tee-head disc-stem connection prevents lateral strain on the stem for smooth, easy operation. Accurately cut threads engage the yoke sleeve for positive control of disc position.
中文: 阀杆：T形阀瓣-阀杆连接防止施加在阀杆侧面的应力，确保操作平稳顺畅容易。轭架套管准确的螺纹连接有助于阀瓣位置的调整控制。
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英文: In -week group, left endite was atrophied and growth of tumor was inhibited. The maximal diameter of tumor was smaller than that in positive control group [(. ±0.), ( .9±0. 7) cm, t=.7, P < 0.00].
中文: 瘤体移植 周后门静脉阻断组动物左内叶明显萎缩,肿瘤的生长明显受抑制,其瘤体最大径明显小于阳性对照组[分别为(.±0.),( .9±0. 7)cm,t=.7,P<0.00]。
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英文: The assay system of the biological activity of lymphotoxin was established using L929 cell as the sensitive target, LT international standard as the positive control and crystal violet staining method to detect viable cell after treated with LT.
中文: 为确定经上述步骤纯化后得到的目的蛋自LT△27的生物活性，本研究以L929细胞为靶细胞、淋巴毒素国际标准品为参照，采用结晶紫染色法检测经淋巴毒素处理后存活的细胞，对淋巴毒素生物活性测定的细胞接种浓度、淋巴毒素标准品板上稀释的起始浓度和梯度稀释的倍数、放线菌素D的使用剂量等进行条件实验后，建立了人淋巴毒素生物活性测定方法。
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