2.jǐn liàng means to strive to achieve the maximum within a certain range. Detailed interpretation: maximum. Wei Wei's War on the South Bank of Hanshui River: "Their planes and cannons can bombard as much as possible, day and night, rain or shine."
3.jìn liàng reaches the maximum value. Do everything possible within a certain range. Chapter 9 of Guo Moruo's Hongqubo: "The reactionaries will cherish them and try their best to make use of them."