There are four methods to solve the problem in this passage.

在这篇文章中有四种方法来解决这个问题。

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We keep trying all four methods

我们一直在尝试这四种方式

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We keep trying all four methods.

我们一直在尝试这四种方式。

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Jess Ford of the Government Accountability Office said that despite using multiple methods, the station's audience remains small based on four telephone surveys conducted since 2003.

VOA: standard.2009.06.18

This is the lowest cost and least speculative investment strategy of the four methods.

FORBES: Investment Principle Matters to Principal

Nextdoor verifies each person's address by using one of four methods: credit- or debit-card number, landline phone number, mobile-phone number or by mailing a postcard that includes an invite code.

WSJ: Nextdoor Review: Social Network Brings Neighbors Together

There are four possible methods to calculate basis in a fund, but the fund companies assume you're using the "single category average cost" method.

FORBES: Magazine Article