Even better, keep wallets attached to a cord or chain that is fastened to a belt.
更好的办法是把钱包栓在绳子上或链子上,再系在皮带上。
To keep the chain of gifts alive, we invite you to pay for those who dine after you.
为了让礼物的链条延续下去,我们邀请你继续为后面的顾客付款。
Well, we could use differentials, like we did here, but we can also keep using the chain rule.
我们可以用微分,就像这样,也可以用链式法则。
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