Kevin Church/BBC News
The British weren’t alone in their hunt. Chileans, New Zealanders, and South Africans, among others, were also scrambling to source this strategic substance. A few months after the Pearl Harbor attack, the U.S. War Production Board restricted American civilian use of agar in jellies, desserts, and laxatives so that the military could source a larger supply; it considered agar a “critical war material” alongside copper, nickel, and rubber.1 Only Nazi Germany could rest easy, relying on stocks from its ally Japan, where agar seaweed grew in abundance, shipped through the Indian Ocean by submarine.2，推荐阅读搜狗输入法下载获取更多信息
Thomas Watters, managing director and sector lead for oil and gas at research firm S&P Global Ratings, says US firms have the ability to repair Venezuela's infrastructure, but it has to make economic sense.。爱思助手下载最新版本对此有专业解读
Advances in organ and computer models are raising the prospect that some animal experiments could be eliminated. But there are still huge hurdles to overcome.
You don't have permission to access the page you requested.