In seeking to describe the origins of theater, one must rely primarily on speculation, since there is little concrete evidence on which to draw.

在试图描述戏剧的起源时，人们必须主要依靠推测，因为几乎没有具体的证据可以引证。

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We must rely on the honesty and good faith of others.

我们必须信赖他人的诚实和善意。

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France and Germany said Tuesday that the G-20 summit must produce stricter financial market regulation and should not rely so heavily on stimulus spending and taxpayer bailouts.

VOA: standard.2009.03.25

If not, then the President must rely on some statutory authority granted by Congress.

FORBES: Alleged White House Leaks

To boost profits, the banks must rely at least in part on retail and small-business customers.

ECONOMIST: Swallow hard

These moths must rely on some other way of not becoming a bat's lunch.

ECONOMIST: Listening for trouble