The phrase "are largely decided" is correct and usable in written English.
It can be used when discussing outcomes or conclusions that have been mostly determined or settled.
Example: "The outcomes of the negotiations are largely decided, and we can now move forward with the implementation phase."
Alternatives: "are mostly determined" or "are primarily settled."
But German elections, like American ones, are largely decided on domestic issues, and Mr. Schröder is suffering because of a stagnant economy and high unemployment.
In order to further increase the electric output of TENG, we prepared a micro-nano structured POM film since charges generated by friction are largely decided by the surface morphology of friction materials [21].
Now, given that the smartphone wars are largely decided by the available apps on any one platform, it isn't a great move to defer payments to those developers that will define your platform — especially as the boys in Redmond have been accepting apps since October.
The president has less control over social issues, which are largely decided on the state and court level, rather than by the executive branch.
Although the content of reports is regulated, the format and presentation are not, and are largely decided by the lab performing the test.
Of course, in games where the result is largely decided, viewership may drop off.
The 2000 Tour was largely decided on the Pyrenean climb to Hautacam, on Monday, July 10th.
In the traditionally patriarchal Indian family, marriage of girls is largely decided by the senior male members of the family.
First, the "potential" for which these unconditional offers are given is largely decided by the clairvoyant grade predictions of teachers, known to be incorrect about half the time.
Given that most races will be decided in the Sept. 11 primary and the subsequent runoff, the Council's complexion for 2002 will be largely decided within a few months.
But the centre, while purporting to be an "open platform for the exploration of ethical questions", is largely decided on the issue of refugees in offshore detention: the brunt of their published content is overwhelmingly critical.
