The other main type of altruism for which we have a well-worked-out Darwinian rationale is reciprocal altruism ('You scratch my back and I'll scratch yours').

另一個主要的利己行為是互惠（你替我搔背中文自拍日韩视频在线观看，我也替你搔背）美女黄网站色视频免费国产，很好地吻合了達(dá)爾文原理色哟哟亚洲一区二区三区四区。

And sincerely hope to establish long-term, wide-ranging strategic partnership, mutual benefit and development!

并真誠希望與之建立長期毛茸茸性XXXX、廣泛的戰(zhàn)略合作伙伴關(guān)系免费一级黄片无码精品，互惠互利黄色网站免费在线提供，共圖發(fā)展！

Ross company will be in the new century, I sincerely look forward to working with domestic and foreign friends and customer friendly exchanges, work together for mutual benefit, a total of Almon Fig.

羅斯通公司將在新的世紀(jì)中狼友视频网站在线播放，誠摯地期望與國內(nèi)國外朋友和客戶友好交往六月亚洲色婷婷在线网站、攜手合作特黄特硬特黄的黄片，互惠互利、共展鴻圖国内自拍视频在线看。

Our facty insists on the principle "sincere service mutual profit". Warmly welcome all clients to contact make a deal with us.

我廠本著真誠服務(wù)欧美激情视频综合二三区、互惠互利的原則，熱誠歡迎社會各界仁仕來人來電聯(lián)系業(yè)務(wù)色欲成人影院在线观看视频网站！

Don't put your trust in mutual funds unless they are fully indexed.

不把你的信任互惠基金宅男欧美第一页，除非他們完全索引。

Domestic and oversea traders are welcome to negotiate for our development and for opening up a new situation of the culture of konjak food as a health-conducive food.

我們將遵循&誠信雙贏操碰在线黄色视频、互惠互利&的原則欧美另类国产日韩，愿同社會各界人士發(fā)展合作關(guān)系，歡迎海內(nèi)外客商前來洽談一道本在线视频播放，共謀發(fā)展国产一区日韩，共創(chuàng)魔芋健康食品文化新境界。

Eva Linder, au pair in Florida

伊娃琳達(dá)欧美97，在福羅里達(dá)州的互惠生

Ficus - bees are symbiotic system of plants belong to banyans moraceae with little bees pollinate banyan with the ecology benefit form.

榕-蜂共生系統(tǒng)是蓋ww.黄色大片？崎艑僦参锱c傳粉榕小蜂專一互惠形成的生態(tài)學(xué)關(guān)系。

We also consider a parabolic system in a three species mutualistic modelIt is shown that any solution with time delays is global.

我們還研究了另一類三種群單鏈環(huán)狀互惠拋物模型并考慮了具時滯的問題色拍拍综合视频。

Fig/fig pollinator mutualistic systems are exploited by non-pollinating fig wasps.

榕樹與傳粉榕小蜂的互惠共生體系被多種非傳粉榕小蜂利用殴美性爱肛交高清在线。