Collaboration across borders is key to solving global health challenges.
帮助别人，做善事，最令我愉悦；认真读书，重修养，最为人赞许。
The past is always tense, the future perfect.
如果时空穿梭是可能的，那从未来穿越回来的旅客在哪里呢？
The most important thing is to enjoy your sport. If you don't enjoy it, you won't be able to give your best.