核心问题
请辨析 by half 与 by halves。
词典解答
by half 指“大大地”；“(减少或增加)一半”，而 by halves 是指“不完全地”“不彻底地”“半心半意地”。请对比：
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too long by half 长了一半
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They have reduced costs by half. (ELD) 他们将成本降低了一半。
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Better not(to) do it at all than do it by halves. (LDCE) 与其做不全,还不如干脆不做。
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He never does things by halves. (Wood) 他做事从不半途而废。