Use no more than two different fonts — one for headings another for content and no less than a 30 pt font so that people at the back of the room can read them easily.
使用不超过两种以上的字体，一种是标题，另一种是正文，而且不要小于30号字，以便人们在背阴的房间中也能轻松阅读。
Phyllodes tumor shows a wide spectrum of morphology. There are no clearly distinct boundaries between PT and fibroadenoma.
叶状肿瘤形态谱系宽泛，与纤维腺瘤之间没有明确的界限。
Silicone polyether surfactant was synthesized by the addition reaction of low hydrogen content silicone and allyl polyether with Pt catalyst and under no solvent condition.
通过采用铂催化剂催化低含氢硅油与烯丙基聚醚的硅氢加成反应合成了有机硅聚醚表面活性剂。
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