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A method to decide whether a vertex on a plane is in a convex polygon or not is presented according to the sign of the third dimension element of cross product of two vect...

引入利用向量叉积符号判定三角形的方向，进而判别平面上一点是否在凸多边形内的方法，简化了计算。

The colorful red and black patterns on the coral snake are a warning sign. Apparently, the bright, flashy colors and pattern let other animals know that it carries a deadly poison.

这种蛇所带有的醒目、艳丽的颜色花纹意味着它带有致命的毒液。

Three batches of bivalent inactivated oil adjuvant vaccine to avian infectious coryza were produced and the safety and efficacy of them were also evaluated in this study.15 chickens were injected intramuscularly with 4-5 mL vaccine,there was no significant sign to be observed,and no lesions on the injecting spot after 2 weeks.

应用3批鸡传染性鼻炎二价油乳剂灭活疫苗进行了安全性和近期免疫效力检验，安全性试验采用15只鸡进行，胸肌注射疫苗4～5 mL/只后，逐日观察，结果鸡只食欲、精神未见异常，2周后观察，注射部位未发现明显异常和病变。

Firstly, this paper puts forward an improved authentication and key distribution scheme for internet environment, in which we adhibit multilevel authentication center, encryption technology of DES, RSA and one-way function to actualize the safety of communication among the different user on network and reduces the workload of the authentication institution; at the same time, this scheme can also assure the security of network. Besides, it use the temporary symbol and the responds" sign of both-side correspondent to replace time stamp and applies them to internet communication to countercheck "rebroadcast attack and accordingly resolves the problem that it needs synchronization for network clock.

本文在首先提出一种改进的Internet网络环境下的认证及密钥分配方案，该方案考虑采用了多级认证中心，DES、RSA和单向函数加密机制，实现了网络上不同用户间的安全通信，降低了网上认证机构的工作量，同时也能够保证网络的安全性；并用通信双方的临时标志和响应者标识来代替时间戳应用于Internet通信中以防止"重播"攻击，从而解决了以往需要网络时钟同步这一难题。

A scow or a raft went by so close we could hear them talking and cussing and laughing -- heard them plain; but we couldn't see no sign of them; it made you feel crawly; it was like spirits carrying on that way in the air.

我们在白天里就是这么懒洋洋，这么懒懒散散，在一片寂静之中凝听着。有一会浓雾沉沉，河上驶过的木筏之类，一路上敲打着白铁锅，免得自己被轮船撞翻。

Right by the park sign, a sample of the unique desert plants are present:Saguaro, the giant cactusCholla, the thorny plant on the rightCreosote bush, the bush with yellow flowers. It is liternally the oldest plant in the world. The root system will survive and grow outwards once the parent plant dies and eventually it will form a big ring of creosote bush.

在公园标示右边，有画上这种特殊沙漠植物的简图， Saguaro是巨大的仙人掌； Cholla是右边多刺的植物；开黄花的Creosote 灌木，是世界上最古老的植物，一旦母株死亡，根系仍然生存且向外生长成一大环形的Creosote 灌木丛。

A new data model for guide sign system is crested based on the traditional node-arc data model.

将这种数据模型应用于广州市城市路网的指路标志系统中，实现了城市路网指路标志的自动生成。

So if you're fighting over leaving the curling iron plugged in, that's probably a sign that something bigger is going on.

如果你们正在为有没有把烫发钳的插销拔掉而吵架，可能就预示着有什么更重大的事情要发生了。

CMC is used as woof trimming agent replacing traditional starch paste material, which can reduce pollution of woof during sizing and desizing. At the same time, CMC can form a membrane on woof which reduces"drop woof"and "decollation" sign.

CMC作为织物的整理剂，用于取代传统的淀粉浆料，大大减少了在织物上浆及退浆中对环境的污染，同时CMC在织物纤维上形成薄膜；而CMC薄膜具有吸湿性，增加了织物的塑性，减少高速织机上"跳纱"、"断头"现象。

I said, to see this in time ; I do not mean to say that our own eyes will look upon it : it may be so far off, as indeed it seems to some, that many would scarcely think it worth while thinking of: but there are some of us who cannot turn our faces to the wall, or sit deedless because our hope seems somewhat dim ; and, indeed, I think that while the signs of the last decay of the old art with all the evils that must follow in its train are only too obvious about us, so on the other hand there are not wanting signs of the new dawn beyond that possible night of the arts, of which I have before spoken : this sign chiefly, that there are some few at least who are heartily discontented with things as they are, and crave for something better, or at least some promise of it — this best of signs : for I

我说，看到这个时间；我的意思并不是说，我们自己的眼睛看它：它可能是如此遥远，因为事实上它似乎一些，许多将几乎认为值得思考：但有一些我们谁不能把我们的脸在墙上，或坐在deedless因为我们的希望似乎有些暗淡；，事实上，我认为，虽然在过去的迹象衰变旧艺术与所有的罪恶，必须遵循的列车只对我们太明显，所以在另一方面有不想标志的新的曙光超出可能晚上的艺术，我面前讲：这个标志主要是，有一些少数至少谁衷心不满是因为他们的事情，并渴望有更好的，或者至少是它的一些承诺-这最好的迹象：对我猜想，如果一些半打男子在任何时候切实心中对未来哪些东西没有人与自然的不和谐，这将成为过去一天或其他；因为它不是偶然的一个想法开始的首长少数；而他们推的，并被迫发言或行为中的一些搅拌世界心脏否则得不到表达。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。