总之这个词是指三个必需氨基酸-亮氨酸，异亮氨酸和缬氨酸。
In short the term refers to three essential amino acids - leucine, isoleucine and valine.
但脊柱裂羊水中的苏氨酸、丝氨酸与异亮氨酸、亮氨酸、缬氨酸的比值明显地高于正常值。
Moreover the ratio of threonine and serine to isoleucine leucine and valine in the amniotic fluid of spina bifid a fetus is higher than normal.
必需氨基酸包括亮氨酸、异亮氨酸、赖氨酸、蛋氨酸、苯丙氨酸、苏氨酸、色氨酸和缬氨酸。
The essential amino acids are leucine isoleucine lysine methionine phenylalanine threonine tryptophan and valine.
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